unregretfulWiktionary 原文英美构词拆解unun-前缀regretfulregretful词干un-(added to adjectives or past participles) not · (added to nouns) lack of词源说明From un- + regretful.释义形容词adjective1Not regretful; having no regrets.同族词派生词 2unregretfully·unregretfulness