adjective
questionable, unclear
Synonyms: ambiguous, borderline, chancy, clouded, contingent, debatable, dicey, disreputable, doubtable, dubious, dubitable, equivocal, far-fetched, fat chance, fishy, hazardous, hazy, iffy, impugnable, inconclusive, indecisive, indefinite, indeterminate, indistinct, insecure, long shot, obscure, on thin ice, open, pending, precarious, problematic, shady, sneaky, speculative, suspect, suspicious, touch-and-go, touchy, uncertain, unconfirmed, undecided, uneasy, unsettled, unstable, unsure, up for grabs
Antonyms: certain, clear, confirmed, decided, definite, exact, resolved, settled, unquestionable
adjective
not believing
Synonyms: agnostic, baffled, confused, discomposed, disconcerted, distracted, distrustful, disturbed, doubting, dubious, equivocal, faithless, faltering, flustered, hesitant, hesitating, in a quandary, in clouds, indecisive, in dilemma, irresolute, like doubting Thomas, lost, not following, of two minds, perplexed, puzzled, questioning, skeptical, suspicious, tentative, theoretical, troubled, uncertain, unconvinced, undecided, unresolved, unsettled, unsure, vacillating, wavering, without belief
Antonyms: believing, certain, confident, convinced, sure, trusting