Synonyms: untrustworthy, untrusty
Definition: not worthy of trust or belief
Usage: an untrustworthy person
Similar words: devious, shifty
Definition: characterized by insincerity or deceit; evasive
Usage: a devious character; shifty eyes
Similar words: shady, fly-by-night
Definition: (of businesses and businessmen) unscrupulous
Usage: a shady operation
Similar words: tricky, slippery
Definition: not to be trusted
Usage: how extraordinarily slippery a liar the camera is- James Agee