adj.

1. 1. Open to doubt or challenge; problematic.
   2. Not yet determined or specified.
2. Of dubious morality or respectability: a questionable reputation.

questionableness ques'tion·a·ble·ness or ques'tion·a·bil'i·ty n.
questionably ques'tion·a·bly adv.

adjective

1. In doubt or dispute: arguable, contested, debatable, disputable, doubtful, exceptionable, moot, mootable, problematic, problematical, uncertain. See certain/uncertain.
2. Not affording certainty: ambiguous, borderline, chancy, clouded, doubtful, dubious, dubitable, equivocal, inconclusive, indecisive, indeterminate, problematic, problematical, uncertain, unclear, unsure. Informal iffy. Idioms: at issue, in doubt, in question. See certain/uncertain, clear/unclear.
3. Not likely: doubtful, improbable, unapt, unlikely. See likely/unlikely.
4. Of dubious character: doubtful, equivocal, shady, suspect, suspicious, uncertain. Informal fishy. See honest/dishonest.

adj

Definition: doubtful, uncertain
Antonyms: certain, definite, indisputable, proven, sure, undoubted, unquestionable

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Note: click on a word meaning below to see its connections and related words.

The adjective has 2 meanings:

Meaning #1: subject to question
  Antonym: unquestionable (meaning #1)

Meaning #2: able to be refuted
  Synonym: refutable

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Dansk (Danish)
adj. - mistænkelig, tvivlsom

Nederlands (Dutch)
twijfelachtig, dubieus

Français (French)
adj. - discutable, douteux

Deutsch (German)
adj. - fraglich, zweifelhaft

Ελληνική (Greek)
adj. - αμφίβολος, προβληματικός, ύποπτος, σκοτεινός

Italiano (Italian)
dubbio, discutibile, incerto

Português (Portuguese)
adj. - duvidoso

Русский (Russian)
сомнительный

Español (Spanish)
adj. - cuestionable, discutible, dudoso

Svenska (Swedish)
adj. - tvivelaktig, diskutabel, tvivelaktig, misstänkt

中文（简体） (Chinese (Simplified))
可疑的

中文（繁體） (Chinese (Traditional))
adj. - 可疑的

한국어 (Korean)
adj. - 의심스러운, 문제시 되는

日本語 (Japanese)
adj. - 疑わしい, いかがわしい, 不正直な

العربيه (Arabic)
‏(صفه) المشكوك فيه‏

עברית (Hebrew)
adj. - ‮מוטל בספק, מפוקפק‬

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