There are a few different synonyms for indefinite. You can have synonyms like unsettled, unknown and uncertain.

__________________________________________________________________SomeSynonyms are:

• bottomless,
• boundless,
• endless,
• fathomless,
• horizonless,
• illimitable,
• immeasurable,
• immensurable,
• limitless,
• measureless,
• unbounded, unfathomable,
• unlimited

Some common words with the suffix -able:

(a comprehensive list is farther down)

• affordable
• accountable
• allowable
• attachable
• approachable
• attainable
• admirable
• available
• amiable
• adorable
• breakable
• bankable
• believable
• beatable
• burnable
• billable
• bearable
• capable
• conceivable
• concealable
• chargeable
• charitable
• contestable
• chewable
• controllable
• countable
• culpable
• deniable
• drinkable
• disputable
• detachable
• delectable
• definable
• drawable
• detectable
• degradable
• electable
• endurable
• excusable
• erasable
• enforceable
• flammable
• foreseeable
• forcible
• forgivable
• freezable
• fashionable
• guessable
• hummable
• hittable
• invokable
• inflatable
• inescapable
• inevitable
• inhabitable
• irrevocable
• incurable
• incapable
• invaluable
• justifiable
• lovable
• laughable
• likable
• mailable
• matchable
• malleable
• measurable
• marketable
• mountable
• noticeable
• negotiable
• operable
• parable
• predictable
• pleasurable
• payable
• probable
• passable
• playable
• packable
• patchable
• packable
• pourable
• portable
• reliable
• remarkable
• receivable
• refutable
• recordable
• recyclable
• rechargeable
• respectable
• readable
• spendable
• savable
• salvageable
• stoppable
• solvable
• soluble
• suitable
• sustainable
• sinkable
• singable
• traceable
• touchable
• tolerable
• teachable
• unspeakable
• undeniable
• unfathomable
• unsuitable
• vulnerable
• valuable
• wearable
• watchable
• walkable
• winnable

Comprehensive alphabetical list of words that end in -able

(NOT ALL have the suffix -able):

abatable abdicable able abolishable abominable abradable absorbable abstractable abusable acceptable accomplishable accountable accreditable accruable achievable acquirable actable actionable adaptable addable addressable adjustable administrable admirable adoptable adorable adsorbable advisable affable affectable affirmable affixable affordable agglutinable agitable agreeable alienable alliable allocable allocatable allowable alterable amenable amendable amerciable amiable amicable amortizable amusable analyzable answerable anticipatable antifashionable appealable appeasable applaudable applicable apportionable appreciable approachable appropriable approvable arable arbitrable arguable articulable ascendable ascertainable ascribable assailable assessable assignable assimilable assumable atonable attachable attainable attemptable attributable auditable automatable available avoidable avowable awardable bailable bankable barrable bearable beatable beddable believable bendable biddable billable bindable bioavailable biodegradable bitable biteable blamable bleachable boatable boilable bondable bookable bootable breakable breathable bribable bridgeable buffable buildable burnable buyable cable calculable callable camouflageable cancelable cancellable canoeable capable cartable cascable cashable castable catchable causable censurable certifiable changeable chargeable charitable checkable chelatable cherishable chewable circulatable citable citeable claimable classifiable cleanable clearable cleavable climbable closable closeable clubable clubbable coachable coagulable codable cogitable cognizable coinable collectable colorable combinable comfortable commandable commendable commensurable committable communicable commutable companionable comparable compassable compellable compensable compoundable computable computerizable concealable conceivable condemnable condensable conditionable condonable conferrable confessable confirmable confiscable confiscatable conformable connectable conscionable considerable consignable constable construable consumable containable contestable contradictable contrastable controllable conversable cookable copyrightable correctable correlatable countable coverable covetable creditable criticizable crossable crunchable crushable crystallizable culpable cultivable cultivatable curable curbable cuttable damnable danceable datable dateable debatable decasyllable deceivable decidable decipherable declarable declinable decomposable defendable deferrable definable deflectable deformable defrayable degradable delectable delegable deliverable demandable demonstrable demountable deniable denumerable dependable depletable deplorable deployable deportable depreciable derivable describable desirable despicable detachable detectable determinable deterrable detestable detonable detonatable developable devisable diagnosable diagnoseable diagonalizable diagrammable dialyzable differentiable dilatable diminishable dimmable dippable disable disagreeable disavowable discardable discernable dischargeable disciplinable discomfortable discountable discourageable discoverable discreditable discriminable discussable dishonorable dislikable dislikeable dispensable displaceable displayable disposable disprovable disputable disreputable disrespectable disserviceable dissociable dissolvable dissyllable distinguishable distractable distrainable disyllable dividable doable documentable doubtable dowable downloadable draftable dramatizable drapable drapeable drawable drillable drinkable drivable driveable droppable dryable dubitable dupable durable dutiable dyable dyeable eatable editable educable effable effaceable ejectable electable embarrassable embossable embraceable emendable employable emulsifiable enable encashable endorsable endurable enforceable enjoyable enlargeable enterable enumerable enunciable enviable equable equiprobable equitable eradicable erasable erectable escheatable establishable estimable evadable evitable evocable evolvable exactable examinable exceptionable exchangeable excisable excitable excludable excusable execrable executable exercisable exorable expandable expectable expellable expendable expiable explainable explicable exploitable exportable extendable extinguishable extractable extraditable extricable extrudable eyeable fable faceable factorable fadable falsifiable farmable fashionable fathomable fatigable favorable feedable fellable fermentable fertilizable fileable filmable filterable filtrable finable findable fineable fireable fishable fissionable fittable fixable flammable flappable flushable flyable foamable focusable foilable foldable fordable forecastable foreseeable forfeitable forgeable forgettable forgivable formable formalizable formidable framable frameable frankable friable furlable gable gainable gelable generable generalizable getable getatable gettable giveable gleanable gnawable governable gradable grantable graphitizable graspable grazable grazeable groupable growable guessable guidable gullable gustable habitable handleable hangable harvestable, hateable hatchable hateable healable hearable heatable helpable hendecasyllable heritable hewable hidable hirable hireable holdable honorable honourable hospitable huggable hummable huntable hydrolyzable hypercoagulable hyperexcitable hyperirritable hypermutable hypnotizable identifiable ignitable ignorable illaudable illimitable illuminable imaginable imitable immeasurable immedicable immensurable immitigable immovable immunoassayable immutable impalpable impassable impeachable impeccable impenetrable imperceivable imperishable impermeable imperturbable implacable implantable imponderable importable impracticable impregnable impressionable improbable improvable impugnable imputable inadvisable inalienable inalterable inappeasable inapplicable inappreciable inapproachable inarable inarguable incalculable incapable inclinable includable incommensurable incommunicable incommutable incomparable incomputable inconceivable inconsiderable inconsolable inconsumable incontestable incontrollable incorporable increasable inculpable incunable incurable indecipherable indeclinable indecomposable indefatigable indefinable indemonstrable indescribable indeterminable indictable indisciplinable indiscoverable indispensable indisputable indissociable indistinguishable indomitable indubitable ineducable ineffable ineffaceable ineluctable inenarrable inequitable ineradicable inescapable inestimable inevitable inexcusable inexorable inexpiable inexplainable inexplicable inexpugnable inextinguishable inextricable inferable inflammable inflatable inflectable influenceable inhabitable inheritable inhospitable inimitable injectable innumerable inoperable insatiable inscrutable inseparable insociable insolvable instable insufferable insuperable insupportable insurable insurmountable integrable interchangeable interminable interoperable interpretable intersubstitutable intertranslatable intolerable intractable intuitable invaluable invariable investable inviable inviolable invulnerable ionizable irradicable irreclaimable irreconcilable irrecoverable irrecusable irredeemable irreformable irrefragable irrefutable irremeable irremediable irremovable irreparable irrepealable irreplaceable irreproachable irresolvable irretrievable irrevocable irritable isolable isolatable issuable jettisonable joinable justiciable justifiable keepable kickable kissable kneadable knowable knowledgeable labelable lamentable lapsable laudable laughable leachable learnable leasable lendable leviable liable licensable lienable liftable likable likeable limitable linable lineable linkable listable listenable litigable livable liveable loanable localizable locatable lockable losable lovable loveable machinable machineable magnetizable mailable maintainable makable makeable malleable manageable maneuverable manipulable manipulatable mappable marketable marriageable maskable matchable measurable mechanizable medicable medicinable meltable memorable memorizable mendable mensurable mentionable merchantable metabolizable metastable microfilmable microwavable microwaveable millable minable mineable mineralizable miserable missable mistakable mixable mockable modifiable moldable monosyllable mountable movable moveable multivariable mutable namable nameable navigable negotiable nestable nettable nonabsorbable nonaccountable nonarable nonbiodegradable nonbreakable nonburnable noncallable noncancelable noncomparable noncondensable noncontrollable noncrushable nondeferrable nondegradable nondepletable nondetachable nondialyzable nondurable nonexpendable nonfilterable nonfissionable nonflammable nonforfeitable noninflammable noninterchangeable nonjusticiable nonmalleable nonmeasurable nonnegotiable nonperishable nonpolarizable nonquantifiable nonrecyclable nonrefillable nonrefundable nonrenewable nonrepayable nonreturnable nonreusable nonsalable nonsaponifiable nonsedimentable nonshrinkable nonsinkable nonsuperimposable nontaxable nontransferable nonviable normalizable notable noticeable notifiable numberable numerable obeyable objectionable observable obtainable obviable octosyllable openable operable opposable orderable organizable outfable overable ownable oxidable oxidizable pacifiable packable palatable palpable parable paraphrasable pardonable parsable passable patentable pawnable payable peaceable peccable peelable penetrable pensionable perceivable perdurable performable perishable permeable permutable personable persuadable perturbable photodegradable photolyzable pilferable pitiable pivotable placable placeable plantable playable pleadable pleasurable pliable plowable pocketable polarizable polysyllable ponderable portable postponable potable pourable practicable precipitable predicable predictable preferable pregnable presentable preservable presumable preventable previable printable probable processable procurable profitable programmable projectable promotable pronounceable propagable proportionable prosecutable provable prunable publishable pulverable pulverizable punishable purchasable pyrolyzable qualifiable quantifiable quenchable questionable quotable radiable radioimmunoassayable raisable ratable rateable rationalizable reachable readable readjustable realizable reapable reasonable rebuttable recallable recappable receivable rechargeable reclaimable reclosable recognizable recommendable reconcilable reconfigurable recordable recoupable recoverable rectifiable recyclable redeemable rediscountable redoubtable reefable reelable referable refillable reformable refundable refutable regenerable registerable registrable regrettable rehydratable reimbursable reinforceable relatable releasable reliable relievable relishable relocatable remarkable remediable rememberable remittable removable removeable renderable renegotiable renewable rentable repairable reparable repayable repealable repeatable replaceable replenishable repleviable replicable reportable representable reproachable reprogrammable reputable resalable rescuable resealable researchable resectable reservable resettable resolvable respectable respirable restartable restorable restrainable retable retractable retrainable retrievable returnable reusable revealable reviewable revisable revivable revocable revokable revolvable rewardable ridable rideable rinsable rippable ropable rotatable roundtable rowable ruinable rulable rustable sable sailable salable saleable salvable salvageable sanctionable saponifiable satiable satirizable satisfiable saturable savable saveable sayable scalable scannable screenable scrubbable scrutable sealable searchable seasonable sedimentable seeable seisable seizable selectable sellable semblable semipermeable sendable separable servable serviceable settleable severable sewable shakable shakeable shamable shapable shapeable sharable shareable shavable shedable shiftable shippable shockable showable shrinkable singable sinkable sizable sizeable skiable skippable slakable sliceable slidable smokable smokeable sociable solvable sorbable sortable soundable sowable spallable sparable spareable speakable specifiable spendable spillable spoilable spottable spreadable squeezable stable stackable stageable stainable statable stateable statutable stealable steerable stonable stoppable storable stowable stretchable strippable suable subdividable sublimable substitutable subsumable sufferable suitable summable summarizable summonable superable supercomfortable superimposable superposable superserviceable supportable supposable surfable surmountable surpassable survivable sustainable swallowable swayable swimmable switchable syllable takable takeable talkable tamable tameable tannable targetable tarnishable tastable taxable teachable tearable tellable temperable temptable tenable tenantable tenurable terminable testable thermoformable thermostable thinkable throttleable tillable tiltable timetable tippable tithable titrable titratable tolerable totable touchable traceable tractable tradable tradeable trafficable trailerable trainable transferable transferrable transformable transfusable translatable transmittable transmutable transplantable transportable transposable traversable treasonable treasurable treatable triable trisyllable triturable trustable tubbable tunable tuneable turnable turntable typable typeable ultrareliable ultrarespectable unable unacceptable unaccountable unactable unadaptable unadoptable unaffordable unalienable unalterable unamenable unamiable unanalyzable unanswerable unappealable unappeasable unapproachable unarguable unassailable unassimilable unassuageable unattainable unattributable unavailable unavoidable unbearable unbeatable unbelievable unbendable unbreachable unbreakable unbreathable unbridgeable unbudgeable unbuildable unburnable uncapturable uncatchable uncategorizable unchallengeable unchangeable uncharitable uncheckable unchewable unclassifiable unclimbable unclubbable uncomfortable uncommunicable uncompromisable unconceivable unconformable unconquerable unconscionable uncontainable uncontrollable uncopyrightable uncorrectable uncountable uncrossable uncrushable uncultivable undanceable undauntable undebatable undecidable undecipherable undefinable undeliverable undeniable undependable understandable undescribable undesirable undetectable undeterminable undiagnosable undiscoverable undisputable undoable undoubtable undrinkable uneatable uneducable unelectable unemployable unendurable unenforceable unenviable unescapable unexceptionable unexcitable unexplainable unfalsifiable unfashionable unfathomable unfavorable unfindable unflappable unflyable unforeseeable unforgettable unforgivable unfulfillable ungovernable ungraspable unguessable unidentifiable unifiable unignorable unimaginable unimpeachable uninhabitable uninsurable unjustifiable unknowable unknowledgeable unlearnable unlikable unlistenable unlivable unlovable unmanageable unmarketable unmatchable unmeasurable unmemorable unmentionable unmistakable unmixable unmodifiable unmovable unnameable unnegotiable unnoticeable unobjectionable unobservable unobtainable unopenable unpalatable unpardonable unpassable unpatentable unperformable unplayable unpredictable unprintable unprofitable unprogrammable unpronounceable unprovable unpublishable unquantifiable unquenchable unquestionable unreachable unreadable unrealizable unreasonable unreclaimable unrecognizable unreconcilable unrecoverable unrecyclable unredeemable unreliable unremarkable unremovable unrepeatable unresolvable unrespectable unreturnable unreviewable unridable unsalable unsalvageable unsayable unscalable unsearchable unseasonable unsellable unserviceable unshakable unshockable unsinkable unslakable unsociable unsolvable unspeakable unspecifiable unstable unstoppable unsuitable unsupportable unsurpassable unsustainable untamable unteachable untenable untestable unthinkable untillable untouchable untraceable untranslatable ununderstandable unusable unutterable unverifiable unviable unwarrantable unwatchable unwearable unwinnable unworkable upgradable upgradeable usable useable utilizable utterable valuable vanquishable vaporizable variable vegetable vendable venerable verifiable veritable viable viewable vindicable violable visitable vitiable vitrifiable vocable voidable volatilizable votable voteable vulnerable wadable wadeable walkable warrantable washable wastable watchable wearable weighable weldable wettable whistleable willable windable winnable wirable withdrawable workable worktable writable

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