Paramour is used when the relationship is hidden from others, often due to its illicit nature. She kept her meetings with her paramour a well-guarded secret.
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Infidelity Implied
The term usually implies that at least one person involved is cheating on their spouse or partner. The scandal broke when the politician's paramour went public about their affair.
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Negative Connotation
Paramour often carries a negative judgment and is used to express disapproval. Neighborhood gossips whispered about her having a paramour.