Another word for questionable
doubtful, dubious, uncertain, undefined, equivocal, disputable, arguable, obscure, inconclusive, controversial, vague, unsettled, open to doubt, indeterminate, debatable, moot, unconfirmed, problematic, cryptic, occult, apocryphal, hypothetical, mysterious, oracular, enigmatic, ambiguous, indefinite, contingent, provisional, paradoxical, under advisement, under examination, open to question, up for discussion, in question, to be voted on, to be decided, hard to believe, incredible, iffy*; see also uncertain 2.
Having a poor appearance or reputation
dubious, suspicious, suspect, disreputable, of doubtful character, irregular, notorious, of ill repute, unsatisfactory, unsound, thought ill of, under a cloud, unesteemed, ill-favored, unpopular, disagreeable, evil-looking, illegitimate, discreditable, disrespectable, unreliable, untrustworthy, dishonest, fly-by-night, shady*, fishy*, queer*; see also suspicious 2.
Antonyms honored*, esteemed, reputable. See syn. study at doubtful.doubtful.
Another word for questionableadjective
In doubt or dispute:arguable, contested, debatable, disputable, doubtful, exceptionable, moot, mootable, problematic, problematical, uncertain. See certain
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, clear
Not likely:doubtful, improbable, unapt, unlikely. See likely
Of dubious character:doubtful, equivocal, shady, suspect, suspicious, uncertain. (Informal) fishy. See honest