doubtful

doubtful adjective arguable, at issue, conditional, contestable, controvertible, debatable, disbelieving, disposed to question, disputable, distrustful, doubtable, doubting, dubious, dubitable, dubius, equivocal, implausible, improbable, in a dilemma, in a quandary, in dispute, in doubt, in question, in suspense, inconceivable, inconvincible, indecisive, indistinct in character or meaning, irresolute, misbelieving, mistrustful, mistrusting, of uncertain issue, open to doubt, open to question, open to suspicion, problematic, questionable, questioning, speculative, suppositional, unconvincing, unlikely, unresolved, unsettled in opinion, unsolved, unsure, unsustainable, untenable
Associated concepts: doubtful cases, doubtful credit, doubttul debts, doubtful title

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See also: ambiguous, controversial, cynical, debatable, disputable, dubious, dubitative, equivocal, hesitant, implausible, inconclusive, inconvincible, incredible, incredulous, indefinite, irresolute, leery, moot, precarious, problematic, questionable, speculative, suspicious, unbelievable, uncertain, undecided, unsettled, unsustainable, vague