Penitent (adjective / noun) — التائب أو النادم على أخطائه: Feeling or showing sorrow for having done wrong. Below are 8 words with a similar meaning; the linked ones have full GL Dictionary entries with their meaning in Arabic.
Feeling regret; an apology.
Expressing regret or remorse; showing acknowledgment of fault; defensive about beliefs or actions
Feeling guilt, embarrassment, or regret about something one has done or failed to do; distressed by a sense of having fallen short
repentantremorsefulcontriteregretfulatoning