Dictionary

unfaithful

unfaithful

adjective un·faith·ful \ˌən-ˈfāth-fəl\

: having a sexual relationship with someone who is not your wife, husband, or partner

: not accurate

Full Definition of UNFAITHFUL

:  not faithful:
a :  not adhering to vows, allegiance, or duty :  disloyal <an unfaithful friend>
b :  not faithful to marriage vows <suspected her husband of being unfaithful>
c :  inaccurate, untrustworthy <an unfaithful copy of a document>
un·faith·ful·ly \-fə-lē\ adverb
un·faith·ful·ness noun

Examples of UNFAITHFUL

  1. <colonists who later proved to be unfaithful to the cause of independence>

First Known Use of UNFAITHFUL

15th century

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