Synonyms of doubtful

1 Syllable

shying, queer

2 Syllables

queerer, vaguest, queerest, hazy, iffy, unglued, vaguer, dicey, pending, dubious, puzzled, clouded, clueless, tenuous, doubting, shady, touchy, open, halting, suspect, sneaky, chancy, mind-blown, show-me, weak-kneed, fishy

3 Syllables

fact-finding, stochastic, heuristic, handed-down, unsettled, untrusting, dithering, mistrustful, obscure, suspicious, hazardous, unsure, claudicant, factfinding, hesitant, far-fetched, precarious, distrustful, ambiguous, farfetched, unstable, touch-and-go, figmental, contingent, indistinct, doubtable, obscurer, vacillant, jellyfish, skeptical, bollixed, socratic, uneasy, butterflies, inquiring, astraddle, uncertain, diffident

4 Syllables

implausible, scaredy-cat, unhistoric, debateable, debatable, incredulous, problematic, disputable, dubitable, unconfirmed, refutable, legendary, apocryphal, controversial, borderline, nonbelieving, on-the-fence, shillyshally, multivocal, polysemous, unresolved, improbable, unspecific, disinclined, inexplicit, ambivalent, insecure, enigmatic, heterodox, unconvinced, catechistic, outward-looking, equivocal, impugnable, conjectural, unbelieving, unlikely, undecided

5 Syllables

disreputable, unhistorical, unverifiable, unpredictable, hypothetical, problematical, hundred-to-one, indefinite, unbelievable, apprehensive, speculative, unsubstantiated, unconceivable, inconclusive, irresolute, undetermined, indecisive

6 Syllables

inapprehensible, unimaginable, indeterminable, investigatory, indeterminate, unauthenticated