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Adjective: untrustworthy  ún'trúst`wurdhee
  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, untrustworthiness

Antonym: trustworthy