Merriam-Webster Logo
SINCE 1828
Menu
dictionary thesaurus

Thesaurus

unfaithfulness

noun

Synonyms and Antonyms of unfaithfulness

1 lack of faithfulness especially to one's husband or wife

  • he eventually forgave his wifeʼs unfaithfulness
Synonyms of unfaithfulness

disloyalty, faithlessness, falseness, falsity, inconstancy, infidelity, perfidiousness, perfidy
Words Related to unfaithfulness

adultery

betrayal, double-cross, double-dealing, duplicity, sellout, treachery, treason

deceit, deception, lying
Near Antonyms of unfaithfulness

staunchness, steadfastness

dependability, reliability

honesty, trustworthiness
Antonyms of unfaithfulness

allegiance, constancy, devotedness, devotion, faith, faithfulness, fealty, fidelity, loyalty

2 the act or fact of violating the trust or confidence of another

  • the jaw-dropping unfaithfulness of the person she had considered her best friend was deeply hurtful
Synonyms of unfaithfulness

backstabbing, betrayal, business, disloyalty, double cross, faithlessness, falseness, falsity, infidelity, perfidy, sellout, treachery, treason, two-timing
Words Related to unfaithfulness

abandonment, desertion

deceit, deception, double-dealing, duplicity, guile, two-facedness

fraud, informing, lying, snitching, talebearing, trickery
Near Antonyms of unfaithfulness

dependability, reliability, trustworthiness

defense, protection, safeguard, shield
Antonyms of unfaithfulness

allegiance, devotion, faithfulness, fealty, fidelity, loyalty, staunchness, steadfastness

3 a sexual encounter or relationship between a married person and someone other than their spouse

  • there were charges of unfaithfulness on both sides
Synonyms of unfaithfulness

adultery, cheating, infidelity, misconduct, two-timing
Words Related to unfaithfulness

criminal conversation

free love, promiscuity

disloyalty, faithlessness, falseness, inconstancy, perfidiousness, perfidy, treachery

affair (also affaire), amour, fling, love, love affair, romance

intrigue

attachment, infatuation

entanglement, flirtation

liaison, passion
Near Antonyms of unfaithfulness

allegiance, constancy, dedication, devotedness, devotion, fealty, loyalty, steadfastness
Antonyms of unfaithfulness

faithfulness, fidelity

Learn More about unfaithfulness

  1. Spanish Central: Translation of unfaithfulness Nglish: Translation of unfaithfulness for Spanish speakers

Seen and Heard

What made you want to look up unfaithfulness? Please tell us where you read or heard it (including the quote, if possible).

show comments hide comments

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Words at Play

Ask the Editors

Word Games