deficient
adj. 缺乏的，不足的；有缺点的，有缺陷的
例句
Deaf people are sometimes treated as being mentally deficient.
耳聋的人有时被看作智力不健全。
《牛津词典》
Soils are most commonly deficient in nitrogen and phosphorus.
土壤最经常缺乏氮和磷。
Nitrogen-deficient plants exhibit many of the symptoms just described.
缺氮植物表现出上述的许多症状。
