The antonyms for the adjective "un-repenting" include words like remorseful, regretful, ashamed, contrite, repentant, apologetic, and sorry. Unlike "un-repenting," these words express a sense of guilt or regret for one's actions or behavior. These antonyms often imply a willingness to make amends or seek forgiveness. It is important to note that while "un-repenting" suggests a lack of remorse, it is not necessarily the same as being unapologetic or unremorseful. It is possible to be sorry for one's actions but still choose not to repent or seek forgiveness. In conclusion, "un-repenting" can be contrasted with a variety of more penitent or remorseful terms.