inadequate
adjective uk/ɪˈnæd.ɪ.kwət/ us/ɪˈnæd.ə.kwət/
C1 不够好的，劣质的
not good enough or too low in quality
This work is woefully (= extremely) inadequate - you'll have to do it again. 这活儿做得非常糟糕——你必须返工。
C1 （数量）不够的
too small in amount
She rejected the $2 million offer as totally inadequate. 她认为200万美元的出价完全不够，因而拒绝了。
（处理事情）信心不足的
not confident enough to deal with a situation
Maddie's a real expert on art, so I feel completely inadequate whenever I talk to her about it. 麦迪在艺术方面是个真正的专家，因此每次和她谈论艺术我都觉得自己不够格。