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n. pl. in·fi·del·i·ties
a. Unfaithfulness to a sexual partner, especially a spouse.
b. An act of sexual unfaithfulness.
2. Lack of fidelity or loyalty.
3. Lack of religious belief.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


n, pl -ties
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 and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌɪn fɪˈdɛl ɪ ti)

n., pl. -ties.
1. marital unfaithfulness; adultery.
2. disloyalty.
3. a breach of trust; transgression.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.



backdoor man An illicit lover; a person with whom one is having an affair. Such a one presumably enters by the back door to avoid being seen.

bedswerver An adulteress; a woman who strays from the marriage bed. Shakespeare used the term in The Winter’s Tale:

That she’s
A bedswerver, even as bad as those That vulgars give bold’st titles. (II, i)

cuckold This term for the unwitting husband of an unfaithful wife supposedly derives from the cuckoo bird’s habit of depositing its eggs in other birds’ nests. The theory would have more plausibility if the word were cuckoo itself and were applied not to the injured party but to the adulteress, as is the case in several other languages. According to Dr. Johnson, the cry of “cuckoo” was formerly used to inform the husband, who subsequently came to be dubbed by the term himself. But even this does not account for the transformation from cuckoo to cuckold. A possibly more plausible explanation may be that the suffix-wold, akin to wild, was coupled with coke ‘cock’ to create a compound meaning ‘horn-mad,’ which may well describe a frustrated husband’s condition, in the circumstances. Compare wittol.

false as Cressida Unfaithful, perfidious; pledging love and fidelity while practicing cuckoldry and adultery; two-faced, hypocritical; traitorous. According to legend set during the Trojan War, Cressida, the daughter of a Trojan priest, had exchanged a pledge of everlasting love and fidelity with Troilus, her beloved. When Cressida was offered to the Greeks in exchange for a group of prisoners, the pledge of fidelity was renewed and sealed with an exchange of gifts. But Cressida had barely arrived in the Greek camp when she succumbed to the charms of Diomedes. To make her abandonment of Troilus even more bitter, she wanted Diomedes to wear Troilus’ gift of a sleeve during their frequent encounters. The legend has been immortalized by Chaucer in Troilus and Criseyde and by Shakespeare:

“Yea,” let them say, to stick the heart of falsehood,
“As false as Cressid.”
(Troilus and Cressida, III, i)

hanky-panky See MISCHIEF.

wear the bull’s feather To be cuckolded. The bull’s feather was a symbol of cuckoldry. A 17th-century song entitled “The Bull’s Feather” popularized this expression.

It chanced not long ago as I was walking,
An eccno did bring me where two were a talking,
Twas a man said to his wife, dye had I rather,
Than to be cornuted and wear a bulls feather.

wear the horns To be made a cuckold, to have an unfaithful wife. The association of horns with cuckoldry appears in many European languages, but no totally satisfactory explanation of the link has been offered. The most plausible relates the cuckold’s “horns” to the spurs of a castrated rooster, formerly implanted at the roots of the excised comb where they reputedly grew into appendages resembling horns. The fact that the German word for cuckold formerly meant ‘capon’ lends considerable credence to this otherwise questionable account. Since the deceived husband has been symbolically stripped of his manhood, the association is logical as well. Whatever the connection, the usage was pervasive. The following appeared in Hickscorner, a pre-Shakespearean drama.

My mother was a lady of the stews’ blood born,
And, … my father wore a horn.

wittol A husband who knows of—and tolerates—his wife’s infidelity. The word is modeled on the older cuckold, with wit-‘knowledge’ as a prefix. Both cuckold and wittol trace back to Middle English; the latter—at least the word—is archaic. Compare cuckold.

Picturesque Expressions: A Thematic Dictionary, 1st Edition. © 1980 The Gale Group, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.infidelity - the quality of being unfaithfulinfidelity - the quality of being unfaithful  
quality - an essential and distinguishing attribute of something or someone; "the quality of mercy is not strained"--Shakespeare
faithlessness, fickleness, inconstancy, falseness - unfaithfulness by virtue of being unreliable or treacherous
disloyalty - the quality of being disloyal
faithfulness, fidelity - the quality of being faithful
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


Collins Thesaurus of the English Language – Complete and Unabridged 2nd Edition. 2002 © HarperCollins Publishers 1995, 2002


The American Heritage® Roget's Thesaurus. Copyright © 2013, 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
خِيانَه، عَدَم إخْلاص
ótryggî, ótrúnaîur


[ˌɪnfɪˈdelɪtɪ] N (to partner) → infidelidad f (to a) (to principle, cause) → deslealtad f (to para con)
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005


[ˌɪnfɪˈdɛlɪti] n [wife, husband, lover] → infidélité f
Collins English/French Electronic Resource. © HarperCollins Publishers 2005


nUntreue f
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007


[ˌɪnfɪˈdɛlɪtɪ] ninfedeltà f inv
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995


(infiˈdeləti) noun
disloyalty or unfaithfulness (eg to one's husband or wife).
Kernerman English Multilingual Dictionary © 2006-2013 K Dictionaries Ltd.
References in classic literature ?
I do not forgive neglect -- I cannot endure infidelity. When I leave any one who weeps at my abandonment, I feel induced still to love him; but when others forsake me and laugh at their infidelity, I love distractedly."
Porthos and his companion alighted before the gate of the little chateau, where we are about to meet again our old acquaintances Athos and Bragelonne, the latter of whom had disappeared since the discovery of the infidelity of La Valliere.
You must understand that I was so far from suspecting infidelity, I regarded it as impossible, and then-- try to imagine it--with such ideas, to find out suddenly all the horror, all the loathsomeness....
Then, worn out by deceit, treasons, infidelity, and the whole body of terrestrial misery, what does he find at the end of his career?
The INFINITE DIVISIBILITY of matter, or, in other words, the INFINITE divisibility of a FINITE thing, extending even to the minutest atom, is a point agreed among geometricians, though not less incomprehensible to common-sense than any of those mysteries in religion, against which the batteries of infidelity have been so industriously leveled.
"For the dissemination of pure truth and to secure the triumph of virtue," he read, "we must cleanse men from prejudice, diffuse principles in harmony with the spirit of the times, undertake the education of the young, unite ourselves in indissoluble bonds with the wisest men, boldly yet prudently overcome superstitions, infidelity, and folly, and form of those devoted to us a body linked together by unity of purpose and possessed of authority and power.
She felt somewhat like a woman who in a moment of passion is betrayed into an act of infidelity, and realizes the significance of the act without being wholly awakened from its glamour.
These things put arguments into the mouth of infidelity.
The infidelity of Molly, which Jones had now discovered, would, perhaps, have vindicated a much greater degree of resentment than he expressed on the occasion; and if he had abandoned her directly from that moment, very few, I believe, would have blamed him.
Unchastity and infidelity were as confused to him as to the Middle Ages, his only moral teacher.
Having settled ourselves into this infidelity, our skill is expended to procure alleviations, diversion, opiates.
He was not originally a cruel or even a severe man; but with passions by nature cold, and with a high, though mistaken, sense of duty, his heart had been gradually hardened by the ascetic life which he pursued, the supreme power which he enjoyed, and the supposed necessity of subduing infidelity and eradicating heresy, which he conceived peculiarly incumbent on him.