Suspicious1. (a.) Inclined to suspect; given or prone to suspicion; apt to imagine without proof.
2. (a.) Indicating suspicion, mistrust, or fear.
3. (a.) Liable to suspicion; adapted to raise suspicion; giving reason to imagine ill; questionable; as, an author of suspicious innovations; suspicious circumstances.
Thesaurus Entries
Pyrrhonic, a bit thick, a bit thin, absurd, agnostic, amoral, apprehensive, arguable, at issue, beyond belief, borderline, cagey, careful, cautious, chary, confutable, conjectural, conscienceless, contestable, controversial, controvertible, corrupt, corrupted, criminal, crooked, dark, debatable, deniable, devious, disbelieving, dishonest, dishonorable, disinclined to believe, disposed to doubt, disputable, distrustful, distrustfully, doubtable, doubtful, doubtfully, doubting, dubious, dubitable, envious, evasive, felonious, fishy, fraudulent, from Missouri, green, green with jealousy, green-eyed, guarded, hard of belief, hard to believe, horn-mad, iffy, ill-got, ill-gotten, immoral, impervious to persuasion, implausible, in dispute, in doubt, in dubio, in question, inconceivable, inconvincible, incredible, incredulous, indirect, insidious, invidious, jaundice-eyed, jaundiced, jealous, leery, mistakable, mistrustful, mistrusting, moot, not deserving belief, not kosher, open, open to doubt, open to question, open to suspicion, passing belief, preposterous, problematic, queer, questionable, questioning, refutable, ridiculous, rotten, sceptical, scrupulous, shady, shaky, shameless, shifty, shy, shy of belief, sinister, skeptical, skeptically, slippery, speculative, staggering belief, suppositional, suspect, suspected, suspecting, suspiciously, tall, thick, thin, tricky, unbelievable, unbelieving, uncertain, unconscienced, unconscientious, unconscionable, unconvincible, unconvincing, uncredulous, under suspicion, underhand, underhanded, unearthly, uneasy, unethical, ungodly, unimaginable, unpersuadable, unpersuasible, unprincipled, unsavory, unscrupulous, unstraightforward, unsure, unthinkable, untrusting, unwilling to accept, unworthy of belief, wary, watchful, without remorse, without shame, yellow, yellow-eyed