unhelpfulWiktionary 原文中文来自 ECDICTadj.不起帮助作用的,无用的,无益的,不予帮助的,不予合作的构词拆分un-前缀(added to adjectives or past participles) not · (added to nouns) lack of+helpful词根/词干词源说明From un- + helpful.释义(英文)形容词 AdjectiveNot providing help or assistance; not helpful.词族派生词(1)unhelpfulness