Definition of infidelity in English:

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Pronunciation: /ˌinfəˈdelədē/

noun (plural infidelities)

1The action or state of being unfaithful to a spouse or other sexual partner: her infidelity continued after her marriage I ought not to have tolerated his infidelities
More example sentences
  • Sure, there are drugs and infidelities and deviant sexuality, but that's the exception for this otherwise decent lot.
  • Affairs, infidelities, sexual peccadilloes fall generally outside the purview of inquisitive political eyes; at any rate, they do not make for fodder for a dirty election campaign.
  • My lovely partner, Patrick, suffered the knowledge of my infidelities and witnessed my mental, physical, and spiritual decay.
unfaithfulness, adultery, cuckoldry, disloyalty, extramarital sex;
deceit, falseness;
affair, liaison, fling, amour
informal fooling/playing around, cheating, two-timing, hanky-panky
formal fornication
2Unbelief in a particular religion, especially Christianity.
Example sentences
  • It is said that he wouldn't stay in a room with men whose conversation was marked by infidelity and blasphemy.
  • As a result of their infidelity, the people descended into moral and spiritual corruption.
  • They are the righteous ones whose garments have not been soiled by infidelity to the patron of the universe.


Late Middle English (in the senses 'lack of faith' and 'disloyalty'): from Old French infidelite or Latin infidelitas, from infidelis 'not faithful' (see infidel).

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