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Adjective: untrustworthy  ,ún'trúst,wur-dhee
  1. Not worthy of trust or belief
    "an untrustworthy person";
    - untrusty

See also: devious, dishonest, dishonorable [US], dishonourable [Brit, Cdn], fly-by-night, shady, shifty, slippery, tricky, undependable, unfaithful, unreliable

Antonym: trustworthy