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a. Not true to duty or obligation; disloyal or unfaithful.
b. Breaking trust in a marriage or relationship by having sexual relations with someone other than one's spouse or sexual partner.
2. Having no religious faith.

faith′less·ly adv.
faith′less·ness n.
Synonyms: faithless, unfaithful, false, disloyal, traitorous, perfidious
These adjectives mean not true to duty or obligation. Faithless and unfaithful imply failure to adhere to promises, obligations, or allegiances: was faithless to her ideals; an unfaithful servant.
False emphasizes deceitfulness or duplicity: "To thine own self be true, / And it must follow, as the night the day, / Thou canst not then be false to any man" (Shakespeare).
One who is disloyal betrays an allegiance: disloyal staff members who exposed the senator's indiscretions.
Traitorous most commonly refers to disloyalty to a government or nation: a traitorous double agent.
Perfidious often connotes vile or contemptible behavior: "The propagandists also highlighted atrocities committed by enemy soldiers, in order to demonstrate the perfidious qualities of the enemy nation" (David A. Bell).
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adv.1.faithlessly - in a disloyal and faithless manner; "he behaved treacherously"; "his wife played him false"
References in periodicals archive ?
Or, more broadly in the context of late modernism, Miller argues: "Sinking themselves faithlessly into a movement grinding to a halt and an aesthetic on the threshold of dissolution, the writers of late modernism prepared themselves, without hope, to pass over to the far side of the end" (14).
14) The baroque melancholic intention "does not faithfully rest in the contemplation of bones, but faithlessly leaps forward to the idea of resurrection" (Benjamin, Origin 233).
Enrile, Erap, Binay: The first distinguished himself for serving faithfully or faithlessly, take your pick, the two most illegitimate, corrupt, tyrannical leaders in this country's history.