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    Infidelity

    /ˌɪn.fɪˈdɛl.ɪ.ti/

    Meaning & Definition

    noun
    The state of being unfaithful to a spouse or romantic partner.
    Her infidelity shattered their marriage and led to a painful divorce.
    The act of cheating or being disloyal in a romantic relationship.
    He struggled to forgive the infidelity that had occurred during their relationship.
    Lack of fidelity to a moral obligation or duty.
    The politician's infidelity to his promises cost him the trust of his constituents.

    Etymology

    From Latin 'infidelitas', meaning 'unfaithfulness'.

    Common Phrases and Expressions

    cheating heart:
    A heart that is unfaithful, particularly in a romantic relationship.
    playing the field:
    Dating multiple people without commitment to any one person.
    two-timer:
    A person who deceives a partner by being romantically involved with another.

    Related Words

    fidelity
    Faithfulness to a person, cause, or belief demonstrated by continuing loyalty.
    betrayal
    The action of betraying someone's trust or confidence.
    disloyalty
    The quality of failing to be loyal to a person or duty.

    Slang Meanings

    home-wrecker
    She’s known as a home-wrecker for breaking up marriages.
    cheater
    He’s such a cheater, always sneaking around behind her back.
    side piece
    He has a side piece he meets when he’s out of town.