adj.

1. Not known or established; questionable: domestic changes of great if uncertain consequences.
2. Not determined; undecided: uncertain plans.
3. Not having sure knowledge: an uncertain recollection of the sequence of events.
4. 1. Subject to change; variable: uncertain weather.
   2. Unsteady; fitful: uncertain light.

uncertainly un·cer'tain·ly adv.
uncertainness un·cer'tain·ness n.

adjective

1. Not affording certainty: ambiguous, borderline, chancy, clouded, doubtful, dubious, dubitable, equivocal, inconclusive, indecisive, indeterminate, problematic, problematical, questionable, unclear, unsure. Informal iffy. Idioms: at issue, in doubt, in question. See certain/uncertain, clear/unclear.
2. In doubt or dispute: arguable, contested, debatable, disputable, doubtful, exceptionable, moot, mootable, problematic, problematical, questionable. See certain/uncertain.
3. Liable to more than one interpretation: ambiguous, cloudy, equivocal, inexplicit, nebulous, obscure, unclear, vague. See certain/uncertain, clear/unclear.
4. Of dubious character: doubtful, equivocal, questionable, shady, suspect, suspicious. Informal fishy. See honest/dishonest.
5. Marked by lack of firm decision or commitment; of questionable outcome: indefinite, open, undecided, undetermined, unresolved, unsettled, unsure, vague. Idioms: up in the air. See certain/uncertain.
6. Experiencing doubt: doubtful, dubious, skeptical, undecided, unsure. Idioms: in doubt. See certain/uncertain.
7. Capable of or liable to change: alterable, changeable, fluid, inconstant, mutable, unsettled, unstable, unsteady, variable, variant. Archaic various. See change/persist.
8. Following no predictable pattern: capricious, changeable, erratic, fantastic, fantastical, fickle, freakish, inconsistent, inconstant, mercurial, temperamental, ticklish, unpredictable, unstable, unsteady, variable, volatile, whimsical. See change/persist, continue/stop/pause.

adj

Definition: doubtful, changeable
Antonyms: certain, clear, definite, determined, foreseeable, secure, sure, unchanging

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IN BRIEF: Not definite. Also: Not sure.

True genius resides in the capacity for evaluation of uncertain, hazardous, and conflicting information. — Winston Churchill (1874-1965).

Dansk (Danish)
adj. - usikker, uvis, ubestemt, ubestemmelig, upålidelig

idioms:

• in no uncertain terms    klappet og klart, fiks og færdig, klar, tydelig

Nederlands (Dutch)
onzeker, onduidelijk, wispelturig

Français (French)
adj. - incertain, instable, variable

idioms:

• in no uncertain terms    en termes on ne peut plus clairs, de manière très directe

Deutsch (German)
adj. - unsicher, ungewiß, unbeständig, vage

idioms:

• in no uncertain terms    ganz eindeutig

Ελληνική (Greek)
adj. - αβέβαιος, αμφίβολος, ασταθής (για καιρό), ακαθόριστος, αναποφάσιστος

idioms:

• in no uncertain terms    απερίφραστα, ξεκάθαρα

Italiano (Italian)
incerto

idioms:

• in no uncertain terms    chiaro e tondo

Português (Portuguese)
adj. - incerto, ambíguo, em dúvida

idioms:

• in no uncertain terms    em termos bem claros

Русский (Russian)
неопределенный, нерешительный, изменчивый (климат и пр.)

idioms:

• in no uncertain terms    в недвусмысленных выражениях

Español (Spanish)
adj. - incierto, dudoso, problemático, indeterminado, inseguro, indeciso, perplejo, vacilante, inconstante

idioms:

• in no uncertain terms    muy claramente, inequívocamente

Svenska (Swedish)
adj. - osäker, oviss, nyckfull, obestämd

中文（简体） (Chinese (Simplified))
无常的, 不可预测的, 不确定的

idioms:

• in no uncertain terms    明确地, 清楚地

中文（繁體） (Chinese (Traditional))
adj. - 無常的, 不可預測的, 不確定的

idioms:

• in no uncertain terms    明確地, 清楚地

한국어 (Korean)
adj. - 불확실한, 단정할 수 없는, 변하기 쉬운

idioms:

• in no uncertain terms    확실하게, 분명하게

日本語 (Japanese)
adj. - 不確実な, 確信が持てない, 変わりやすい, 当てにならない, 不確かな

idioms:

• in no uncertain terms    きっぱり

العربيه (Arabic)
‏(صفه) غير اكيد, مشكوك فيه, غامض, متردد, متقلب‏

עברית (Hebrew)
adj. - ‮לא בטוח, לא ודאי, מפוקפק, מפקפק, הפכפך, לא יציב, לא ברור, לא אמין‬

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