undoubledWiktionary 原文英美undoubled1词源 1构词拆解unun-前缀doubleddoubled词干un-(added to adjectives or past participles) not · (added to nouns) lack of词源说明From un- + doubled.释义形容词adjective1Not doubled.undoubled2词源 2释义动词verb1simple past and past participle of undouble