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suspicious(Distrustful), adjective apprehensive, concerned, disposed to doubt, doubting, dubious, hard to convince, hesitant, inconvincible, jealous, leery, mistrustful, nervous, quizzical, skeptical, suspecting, untrustful, untrusting, untrustworthy, wary, watchful
suspicious(Questionable), adjective abnormal, doubtful, dubious, enigmatic, equivocal, farfetched, hard to believe, irregular, open to doubt, open to question, peculiar, strange, suspect, unbelievable, uncertain, unplausible, unworthy of belief
Associated concepts: suspicious circumstances, suspicious origin
See also: cynical, debatable, disputable, disreputable, guarded, implausible, inconvincible, incredible, incredulous, jealous, leery, questionable, resentful, skeptical, unbelievable, uncertain, vigilant