ungratefulWiktionary 原文/ʌnˈɡreɪtfəl/adj.忘恩负义的，使人不愉快的，徒劳的，讨厌的中文释义来自 ECDICT构词拆解unun-前缀gratefulgrateful词干un-(added to adjectives or past participles) not · (added to nouns) lack of词源说明From un- + grateful.释义形容词adjective1Not grateful; not expressing gratitude.2Disagreeable, repellent, unpleasant.名词noun1A person who fails to show gratitude; an ingrate.同族词