dubious

dubious adjective ambiguous, anceps, arguable, chancy, conditional, confusing, confutable, contestable, contingent, controversial, controvertible, debatable, disputable, doubtful, dubitative, dubius, fallible, hazy, in dispute, in doubt, in question, incertus, insecure, moot, perplexing, provisional, questionable, refutable, shadowy, skeptical, speculative, suppositional, unascertained, unassured, unauthentic, unauthenticated, unauthoritative, uncertain, uncertified, unconfident, undemonstrated, undetermined, unexplained, unreliable, unresolved, unsound, unsure, vacillating, vague, wavering

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See also: aleatory, ambiguous, controversial, cynical, debatable, disputable, doubtful, dubitative, equivocal, inconvincible, incredulous, indefinite, leery, moot, poor, precarious, problematic, questionable, skeptical, speculative, suspicious, unbelievable, uncertain, undecided, unsettled, vague