形容词

1. 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.

2. 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.

1. inadequate in amount or degree

e.g. a deficient education
deficient in common sense
lacking in stamina
tested and found wanting

Synonym: lacking(p)wanting(p)

2. falling short of some prescribed norm

e.g. substandard housing

Synonym: inferiorsubstandard

3. of a quantity not able to fulfill a need or requirement

e.g. insufficient funds

Synonym: insufficient