noun
a person who commits adultery, which is the act of being unfaithful to a spouse or partner by engaging in sexual relations with someone else
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The court sentenced the adulterer to six months in prison.
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I can't believe she cheated on her husband, what an adulterer!
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That guy is such a player, a real adulterer.
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In literature, the character was portrayed as an emotional adulterer, constantly betraying his own beliefs.