[ADJ 形容词]缺乏的；缺少的；不足的 If someone or something is deficient in a particular thing, they do not have the full amount of it that they need in order to function normally or work properly.
[usu v-link ADJ]
[FORMAL 正式]
...a diet deficient in vitamin B.
缺乏维生素 B 的饮食
Deficient is also a combining form.（亦可用于构词）
Vegetarians can become iron-deficient.
素食者可能会缺铁。
2
[ADJ-GRADED 能被表示程度的副词或介词词组修饰的形容词]有缺点的；有缺陷的；不完善的 Someone or something that is deficient is not good enough for a particular purpose.
[FORMAL 正式]
...deficient landing systems.
存在缺陷的降落系统
Oxford
de·fi·cient/dɪˈfɪʃnt; NAmEdɪˈfɪʃnt/adjective( formal) 1deficient(in sth) not having enough of sth, especially sth that is essential 缺乏的；缺少的；不足的◆a diet that is deficient in vitamin A缺乏维生素 A 的饮食2not good enough 有缺点的；有缺陷的◆Deaf people are sometimes treated as being mentally deficient.耳聋的人有时被看作智力不健全。de·fi·cient/dɪˈfɪʃnt; NAmEdɪˈfɪʃnt/
LDC
deficientde‧fi‧cient /dɪˈfɪʃənt/ adjective formal
Word Origin
Examples
Thesaurus
Collocations
1not containing or having enough of something: Women who are dieting can become iron deficient.deficient in patients who were deficient in vitamin C2not good enough: Our prisons are our most deficient social service.
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