noun

paramour

PAIR-uh-moor/ˈpærəmʊr/

A lover, especially in a secret or illicit relationship.

The lover embraces a paramour in the doorway while anxiously watching for the unsuspecting partner.

In a hidden doorway, two lovers embrace while one anxiously checks that a wedding-ringed partner nearby does not see them, making the secret illicit relationship clear.
Etymology

The phrase “with love” or “passionately” became a name for a beloved person or sweetheart. Its once broader affectionate meaning narrowed chiefly to a secret or illicit lover.

In context

Extra History speaker2:04
her new paramour killed a man in an illegal duel and had to flee Versailles. … Julie … joined her lover on the run.
Julie d'Aubigny - Duelist, Singer, Radical - Extra History
The Infographics Show1:08
An encounter with the jealous boyfriend of one of his paramours left him with a distinctive scar
How a Man Sold Eiffel Tower Twice (True Story)

More examples

  • He hides letters from his paramour in a locked drawer.
  • The novel follows two paramours who risk everything for love.
  • Her husband discovers that her paramour is an old friend.

Forms

paramour · paramours

Similar words

lover
A broader term that does not necessarily suggest secrecy.
sweetheart
Usually suggests affectionate romance rather than an illicit relationship.