[ in-fi-del-i-tee ]
/ ˌɪn fɪˈdɛl ɪ ti /

noun, plural in·fi·del·i·ties.

marital disloyalty; adultery.
unfaithfulness; disloyalty.
lack of religious faith, especially Christian faith.
a breach of trust or a disloyal act; transgression.

Nearby words

  1. infeudation,
  2. infibulate,
  3. infibulation,
  4. infidel,
  5. infidelic,
  6. infield,
  7. infield hit,
  8. infield out,
  9. infielder,
  10. infighting

Origin of infidelity

1375–1425; late Middle English < Latin infidēlitās, equivalent to infidēli(s) unfaithful (see infidel) + -tās -ty2 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for infidelity

British Dictionary definitions for infidelity


/ (ˌɪnfɪˈdɛlɪtɪ) /

noun plural -ties

lack of faith or constancy, esp sexual faithfulness
lack of religious faith; disbelief
an act or instance of disloyalty
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for infidelity



c.1400, "want of faith, unbelief in religion; false belief, paganism;" also (early 15c.) "unfaithfulness or disloyalty to a person" (originally to a sovereign, by 16c. to a lover or spouse), from French infidélité, from Latin infidelitatem (nominative infidelitas) "unfaithfulness, faithlessness," noun of quality from infidelis (see infidel).

Online Etymology Dictionary, © 2010 Douglas Harper