Etymology
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untrustworthy (adj.)

1846, from un- (1) "not" + trustworthy. Related: Untrustworthiness.

updated on March 02, 2014

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Definitions of untrustworthy from WordNet

untrustworthy (adj.)
not worthy of trust or belief;
an untrustworthy person
Synonyms: untrusty
From wordnet.princeton.edu, not affiliated with etymonline.