C1 not good enough or too low in quality不够好的,劣质的
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 too small in amount(数量)不够的
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。
not confident enough to deal with a situation(处理事情)信心不足的
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。