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

These can range from infidelity and intimidation to aggression and extreme violence. — David Dematteo, The Conversation, 20 Oct. 2026

But their relationship cracked amid Hill’s infidelity and a lack of trust, Vaccaro testified. — Milena Malaver, Miami Herald, 7 Oct. 2026

Sure, that sounds ridiculous for a season about rape, infidelity, mass murder, suicide, and society’s ruthless commodification of those very things. — Alison Foreman, IndieWire, 6 Oct. 2026

When Rusic filed for divorce the following May, accusing Cecchi Gori of physical abuse and infidelity, the painting became part of the fight. — Mattia Ferraresi, Air Mail, 3 Oct. 2026