commit adultery

Break marriage vows

To commit adultery is to have sexual intercourse with someone other than one's spouse.

The phrase carries moral and legal weight—adultery appears in religious commandments and divorce proceedings.

She discovered he had been committing adultery for years.

The construction with "commit" frames the act as a transgression, like committing a crime or sin.

affair

infidelity

Disloyalty to a partner

tryst · paramour · mistress · lover · cheating · unfaithful · two-timing · philanderer · cuckold · dalliance

morality

sin

Violation of divine law

temptation · lust · carnal · impurity · vice · indecency · impropriety · lechery · licentiousness · debauchery

scandal

tabloid

Sensationalist newspaper format

gossip · expose · notoriety · reputation · backlash · controversy · outrage · indiscretion · sordid · fallout

religious

sinful

Violating moral law

scripture · confession · penance · forgiveness · sanctity · vow · sacred · marriage · testament · stoning

Opposites
marital fidelity

commit adulterybe faithful

Maintain devotion consistently

keep faith · be true · stay true · fidelity · abstain

Family

commit, commits, committed, committing, commitment, committal, commission, committee, adultery

Familiarity
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Used worldwide · Timeless · Negative · Everyday, not technical · Rated PG-13