deficient
/dɪˈfɪʃənt/adjective
predic.
1- not having enough of a specified quality or ingredient不足的, 缺乏的：
this diet is deficient in vitamin B.
这种饮食中缺少维生素B。
1.1
- insufficient or inadequate不充分的, 不适当的：
the documentary evidence is deficient.
文献证据不足。
1.2
- （亦作mentally deficient）offensive having a mental handicap〈冒犯〉有智力障碍的, 傻的。
词源
late 16th cent. （originally in the theological phrase deficient cause， denoting a failure or deficiency that has a particular consequence）： from Latin deficient- 'failing'， from the verb deficere （see DEFECT1）.