unlastingWiktionary 原文1词源 1词源说明See unlast.释义（英文）动词 Verbpresent participle and gerund of unlast2词源 2构词拆分un-前缀(added to adjectives or past participles) not · (added to nouns) lack of+lasting词根/词干词源说明From un- + lasting.释义（英文）形容词 Adjective(obsolete) Not lasting.