deficient /dɪˈfɪʃənt/ adjective Learner's definition of DEFICIENT
[more deficient; most deficient]
1
: not having enough of something that is important or necessary缺乏的；缺少的；不足的 —
usually + in -
a diet deficient in certain vitamins缺乏某些维生素的饮食
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a man who is deficient in judgment [=a man whose judgment is poor]缺少判断力的男子
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students who are deficient [=lacking] in their knowledge of history历史知识匮乏的学生们
2
: not good enough : not as good as others有缺点的；有缺陷的