Antonyms of adj trustworthy

2 senses of trustworthy

Sense 1
trustworthy (vs. untrustworthy), trusty -- (worthy of trust or belief; "a trustworthy report"; "an experienced and trustworthy traveling companion")

untrustworthy (vs. trustworthy), untrusty -- (not worthy of trust or belief; "an untrustworthy person")
        => devious, shifty -- (characterized by insincerity or deceit; evasive; "a devious character"; "shifty eyes")
        => fly-by-night, shady -- ((of businesses and businessmen) unscrupulous; "a shady operation")
        => slippery, tricky -- (not to be trusted; "how extraordinarily slippery a liar the camera is"- James Agee)

Sense 2
trustworthy -- (taking responsibility for one's conduct and obligations; "trustworthy public servants")

INDIRECT (VIA responsible) -> irresponsible -- (showing lack of care for consequences; "behaved like an irresponsible idiot"; "hasty and irresponsible action")

Similarity of adj trustworthy

2 senses of trustworthy

Sense 1
trustworthy (vs. untrustworthy), trusty -- (worthy of trust or belief; "a trustworthy report"; "an experienced and trustworthy traveling companion")
       => authentic, reliable -- (conforming to fact and therefore worthy of belief; "an authentic account by an eyewitness"; "reliable information")
       => creditworthy, responsible -- (having an acceptable credit rating; "a responsible borrower")
       => dependable, honest, reliable, true (predicate) -- (worthy of being depended on; "a dependable worker"; "an honest working stiff"; "a reliable sourcSFLe of information"; "he was true to his word"; "I would be true for there are those who trust me")
       => fiducial -- (based on trust)
       => sure, trusted -- ((of persons) worthy of trust or confidence; "a sure (or trusted) friend")
          Also See-> faithful#1; honest#1, honorable#1; reliable#1, dependable#1; responsible#1

Sense 2
trustworthy -- (taking responsibility for one's conduct and obligations; "trustworthy public servants")
       => responsible (vs. irresponsible) -- (worthy of or requiring responsibility or trust; or held accountable; "a responsible adult"; "responsible journalism"; "a responsible position"; "the captain is responsible for the ship's safety"; "the cabinet is responsible to the parliament")