adj.

1. Fraught with uncertainty or doubt; undecided.
2. Arousing doubt; doubtful: a dubious distinction.
3. Of questionable character: dubious profits.

[From Latin dubius.]

dubiously du'bi·ous·ly adv.
dubiousness du'bi·ous·ness n.

adjective

1. Experiencing doubt: doubtful, skeptical, uncertain, undecided, unsure. Idioms: in doubt. See certain/uncertain.
2. Not affording certainty: ambiguous, borderline, chancy, clouded, doubtful, dubitable, equivocal, inconclusive, indecisive, indeterminate, problematic, problematical, questionable, uncertain, unclear, unsure. Informal iffy. Idioms: at issue, in doubt, in question. See certain/uncertain, clear/unclear.

adj

Definition: doubtful
Antonyms: certain, definite, doubtless, positive, reliable, sure, trustworthy, trusty, undoubtful

adj

Definition: vague, unclear
Antonyms: clear, decided, definite, unambiguous, unobscure

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IN BRIEF: Causing or feeling doubt or uncertainty; questionable in value, quality or origin.

Jim was feeling dubious about his ability to pass the science exam.

Dansk (Danish)
adj. - tvivlrådig, betænkelig, upålidelig

Nederlands (Dutch)
dubieus, twijfelend

Français (French)
adj. - dubitatif, douteux, contestable, suspect, équivoque, incertain de, hésitant de

Deutsch (German)
adj. - fragwürdig, zweifelhaft

Ελληνική (Greek)
adj. - αμφίβολος, αβέβαιος, αμφιβάλλων

Italiano (Italian)
dubbio

Português (Portuguese)
adj. - duvidoso

Русский (Russian)
сомнительный

Español (Spanish)
adj. - dudoso, poco seguro

Svenska (Swedish)
adj. - tvivelaktig

中文（简体） (Chinese (Simplified))
可疑的, 不确定的

中文（繁體） (Chinese (Traditional))
adj. - 可疑的, 不確定的

한국어 (Korean)
adj. - 애매 모호한, 수상한, 불안한

日本語 (Japanese)
adj. - 疑わしい, 疑っている, いかがわしい

العربيه (Arabic)
‏(صفه) مشتبه فيه, مشكوك فيه, مريب‏

עברית (Hebrew)
adj. - ‮מפקפק, מסופק, מפוקפק‬

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