unconstructiveWiktionary 原文英美/ˌʌnkənˈstrʌktɪv/构词拆解unun-前缀constructiveconstructive词干un-(added to adjectives or past participles) not · (added to nouns) lack of词源说明From un- + constructive.释义形容词adjective1Not constructive; unhelpful.同族词派生词 2unconstructiveness·unconstructively