Contrite is a formal adjective used to describe someone who feels regret for their bad behavior, or something, such as an apology, that shows such regret.

// Although the mayor appeared contrite about the most recent scandal plaguing city hall, many constituents remained unpersuaded.

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“At the restaurant, late into the meal, ‘Honey, Honey,’ from the ‘Mamma Mia’ soundtrack began to play, with [Amanda] Seyfried’s 22-year-old voice issuing through the restaurant’s speakers. The waitress came over, contrite. The song was just part of the usual play list. ‘Listen, I love having a stake in pop culture,’ Seyfried reassured her. ‘It’s really nice.’” — Alexis Soloski, The New York Times, 11 Mar. 2025

Props to Elton John: sorry really does seem to be the hardest word. But saying it (in something other than a nonapology, of course) is an important part of being contrite—that is, feeling or showing sorrow and remorse for one’s bad behavior. Contrite traces back to the Latin verb conterere, meaning “to pound to pieces,” “to crush, “to wear out or down,” or “to exhaust mentally or physically.” In Medieval Latin—the Latin used in Medieval times especially for religious or literary purposes—conterere came to mean “to crush in spirit with a sense of one’s sin,” or “to render contrite.” Anglo-French speakers borrowed a form of the verb conterere and made it the adjective contrit, which was in turn adopted into English in the 1300s.