Synonyms and Antonyms of dubious
1 giving good reason for being doubted, questioned, or challenged <any letter bearing the signature of Geronimo would be of dubious authenticity, to say the least> Synonyms debatable, disputable, dodgy [chiefly British], doubtable, doubtful, dubitable, equivocal, fishy, problematic (also problematical), queer, questionable, shady, shaky, suspect, suspiciousRelated Words alleged, so-called, supposed; moot; ambiguous, open, unclear; uncertain, undecided, undetermined; far-fetched, flimsy, improbable, unlikely, weakNear Antonyms decisive, definitive; clear, obvious, open-and-shut, positiveAntonyms certain, hands-down, incontestable, indisputable, indubitable, questionless, sure, undeniable, undoubted, unproblematic, unquestionable
2 slow to begin or proceed with a course of action because of doubts or uncertainty <I'm dubious about our plan to go hang gliding without having had any training> Synonyms cagey (also cagy), disinclined, hesitant, indisposed, loath (also loth or loathe), reluctant, reticentRelated Words uneager, unenthusiastic; averse, unwilling; ambivalent, conflicted, doubtful, faltering, halting, indecisive, infirm, irresolute, questioning, skeptical, uncertain, undecided, unsure, vacillating, wobbly (also wabbly); fainthearted, shy, timidNear Antonyms eager, enthusiastic, glad, happy, keen; ready, willing; certain, decided, determined, resolute, sure, unquestioningAntonyms disposed, inclined
3 not likely to be true or to occur <made the dubious claim of being of royal blood> Synonyms doubtful, improbable, far-fetched, flimsy, questionable, unapt, unlikelyRelated Words implausible, impossible, inconceivable, incredible, unbelievable, unimaginable, unthinkable; absurd, bizarre, crazy, fantastic (also fantastical), foolish, insane, nonsensical, odd, outlandish, preposterous, ridiculous, unreal, wild; outside, remote, slightNear Antonyms believable, conceivable, credible, earthly, imaginable, plausible; possible, potential; liableAntonyms likely, probable
4 not feeling sure about the truth, wisdom, or trustworthiness of someone or something <dubious about a diet that claims I can eat all I want and still lose weight> Synonyms distrustful, doubtful, hinky [slang], mistrustful, skeptical, suspicious, trustless, uncertain, unconvinced, undecided, unsettled, unsureRelated Words ambivalent, conflicted, equivocal; diffident, insecure; halting, hesitant, indecisive, irresolute, vacillating, waveringNear Antonyms assured, confident, sanguine, self-assured; decisive, determined, resoluteAntonyms certain, convinced, positive, sure
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