unconcernWiktionary 原文构词拆分un-前缀(added to adjectives or past participles) not · (added to nouns) lack of+concern词根/词干词源说明From un- + concern, around 1660–1670.释义（英文）名词 NounLack of interest or care; indifference or apathy.Freedom from worry or apprehensiveness; insouciance or nonchalance.词族相关词（1）unconcerned