unfaithful

un·faith·ful

adjective \ˌən-ˈfāth-fəl\

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

Related to UNFAITHFUL

Synonyms

disloyal, false, fickle, inconstant, perfidious, recreant, traitorous, treacherous, faithless, untrue

Antonyms

constant, dedicated, devoted, devout, down-the-line, faithful, fast, loyal, staunch (also stanch), steadfast, steady, true

Related Words

irresponsible, trustless, undependable, unreliable, untrustworthy; faltering, hesitant, vacillating, wavering; dubious, irresolute, uncertain; apathetic, dispassionate, uninterested

Near Antonyms

dependable, dutiful, reliable, responsible, solid, tried, tried-and-true, trustable, trustworthy, trusty; unfaltering, unhesitating, unwavering; determined, intent, resolute; confirmed, dyed-in-the-wool, inveterate, sworn; ardent, avid, enthusiastic, fervent, fervid, impassioned, passionate