The word "unrepenting" refers to someone who refuses to feel regret or remorse for their actions. Some antonyms for this word include "penitent", which refers to someone who is sorrowful for their wrongdoing and seeks forgiveness, "remorseful", which refers to someone who feels deep regret for their actions, and "contrite", which refers to someone who is sincerely sorry for their actions and seeks to make amends. Other antonyms for "unrepenting" include "regretful", "ashamed", "guilty", and "repentant". These words highlight the opposite of the unapologetic and unremorseful attitude associated with someone described as "unrepenting".