untrustworthy

untrustworthy adjective capricious, changeable, conniving, deceitful, deceptive, dishonest, dishonorable, disloyal, double-dealing, faithless, fallible, false, fickle, fraudulent, frivolous, illusive, inconstant, insecure, insidious, irresponsible, mercurial, perfidious, precarious, questionable, shifty, slippery, tergiversating, treacherous, two-faced, unauthenticated, uncertain, undependable, unreliable, unsafe, unsound, unstable, unsteadfast, untrue, unworthy of confidence, unworthy of trust, variable, wavering

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See also: dangerous, dishonest, disingenuous, disreputable, faithless, fallible, false, fraudulent, inaccurate, insecure, irresponsible, machiavellian, perfidious, precarious, questionable, recreant, sinister, suspicious, uncertain, undependable, unreliable, unsound, unsustainable, untrue