Unfaithful

/ʌnˈfeɪθfəl/

Meaning & Definition

adjective

not loyal or faithful; disloyal.

She felt heartbroken when she discovered that her partner had been unfaithful.

having sexual relations with someone other than one's spouse or partner.

His unfaithful behavior led to the breakdown of their marriage.

not adhering to or failing to fulfill obligations or duties.

The unfaithful servant was dismissed for stealing from his employer.

From un- (not) + faithful (loyal, devoted)

unfaithful partner

a partner who is not loyal in a romantic relationship

being unfaithful

the act of being disloyal in a commitment

unfaithful spouse

a married person who engages in romantic relations outside their marriage

faithful

loyal, devoted to someone or something

fidelity

faithfulness to a person, cause, or belief demonstrated by continuing loyalty

two-timer

He's a real two-timer, always cheating on his girlfriend.

cheater

She found out he's just a cheater, breaking her heart.