Dictionary.com
Thesaurus.com
Synonyms

infidelity

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

noun

plural

infidelities
  1. marital disloyalty; adultery.

  2. unfaithfulness; disloyalty.

  3. lack of religious faith, especially Christian faith.

  4. a breach of trust or a disloyal act; transgression.


infidelity British  
/ ˌɪnfɪˈdɛlɪtɪ /

noun

  1. lack of faith or constancy, esp sexual faithfulness

  2. lack of religious faith; disbelief

  3. 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

Etymology

Origin of infidelity

First recorded in 1375–1425; late Middle English, from Latin infidēlitās; equivalent to infidel + -ity

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Burden’s family legacy was fractured by infidelity and a laissez faire attitude, at least in the public sphere, toward men behaving badly.

From Los Angeles Times

In “Anna Karenina,” for instance, Tolstoy immediately plunges into a melodrama of infidelity, marriage proposals and ballroom dancing.

From The Wall Street Journal

If they set aside time to level with each other and open up, she added, “they’re less likely to have issues of financial infidelity.”

From MarketWatch

The ugly primary has featured ads questioning Paxton’s personal wealth and highlighting infidelity claims cited in his continuing divorce process.

From The Wall Street Journal

His renaissance man biography includes a career as a body builder, highlighted by his Mr. Universe titles, action film success, political stardom and even tabloid-fodder infidelity.

From Los Angeles Times