Repentant means genuinely sorry for what you have done. Not caught and embarrassed — sorry, and intending to be different.
The word carries a religious weight it has never quite put down: repentance is confession and a turning away from sin, and repentant sinners fill a great deal of English literature. In ordinary use it keeps that seriousness, so it fits real wrongdoing rather than a forgotten birthday. You will very often meet the negative, and unrepentant is the stronger and commoner of the pair — an unrepentant liar is one who would happily do it again. Remorseful is the everyday synonym with no church attached.
1adjectiverepentantSincerely sorry for having done wrong.
“He seemed genuinely repentant in the witness box.”
synonyms: remorseful, contrite
Proto-Indo-European
*peh₁-
Old French
repentant
Middle English
repentant
English, today
repentant
From Middle English repentant, from Old French repentant, present participle of repentir. by surface analysis, repent + -ant.
Etymology from Wiktionary, CC BY-SA