Synonyms of infidelity

infidelity

noun

ˌin-fə-ˈde-lə-tē 

1

as in adultery

lack of faithfulness especially to one's husband or wife

infidelity can lead to divorce

Synonyms & Similar Words

• adultery
• betrayal
• disloyalty
• faithlessness
• unfaithfulness
• perfidy
• treachery
• inconstancy
• falseness
• perfidiousness
• deception
• falsity
• lying
• deceit
• treason
• duplicity
• double-dealing
• sellout
• double cross

Antonyms & Near Antonyms

• fidelity
• loyalty
• faith
• devotion
• faithfulness
• allegiance
• constancy
• fealty
• reliability
• steadfastness
• devotedness
• dependability
• honesty
• trustworthiness
• staunchness

2

as in betrayal

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

the one thing that the political boss will not forgive is infidelity

Synonyms & Similar Words

• betrayal
• treachery
• treason
• unfaithfulness
• deception
• faithlessness
• disloyalty
• perfidy
• backstabbing
• abandonment
• falseness
• deceit
• lying
• double cross
• falsity
• two-timing
• sellout
• business
• desertion
• duplicity
• fraud
• double-dealing
• informing
• trickery
• guile
• two-facedness
• snitching
• talebearing

Antonyms & Near Antonyms

• fidelity
• loyalty
• faithfulness
• devotion
• allegiance
• steadfastness
• fealty
• reliability
• trustworthiness
• dependability
• defense
• protection
• staunchness
• shield
• safeguard

3

as in misconduct

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

had known about his wife's infidelities for years

Synonyms & Similar Words

• adultery
• misconduct
• cheating
• unfaithfulness
• treachery
• affair
• promiscuity
• two-timing
• romance
• faithlessness
• disloyalty
• perfidy
• love
• intrigue
• infatuation
• inconstancy
• criminal conversation
• falseness
• free love
• flirtation
• love affair
• amour
• perfidiousness
• entanglement
• fling
• attachment
• liaison
• passion

Antonyms & Near Antonyms

• fidelity
• faithfulness
• loyalty
• devotion
• dedication
• allegiance
• constancy
• steadfastness
• fealty
• devotedness

Example Sentences

Recent Examples of infidelity

Last month, six women interviewed by the Times described concerning behavior by Platner, including excessive drinking, infidelity, and, in one account, physical intimidation. — Allison Gordon, CNN Money, 6 July 2026

Ocasio-Cortez notably sidestepped Platner’s candidacy in Maine even as other progressives defended him from the controversy surrounding his infidelity and old social media posts. — David Sivak, The Washington Examiner, 4 July 2026

The woman told investigators that Bernadette had begun to suspect Vander Meer of infidelity, but their relationship, which included secret phones and meetings at pay-by-the-hour motels, continued. — James Powel, USA Today, 26 June 2026

There’s friction between the defense lawyer Sam (Nick Nolte) and his wife, Leigh (Jessica Lange), rooted in Sam’s past infidelity and his current flirtations with a young courthouse clerk who idolizes him. — Scott Tobias, Vulture, 26 June 2026