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. 缺乏的; 不足的
adjective [原级] 缺乏的，不足的；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。
