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Related to doubtful: doubtful debts
doubtfuladjective 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
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