Deficient | Mean of deficient in English Dictionary

/dɪˈfɪʃənt/

• not having enough of something that is important or necessary
1. a nutritionally deficient diet
2. a diet deficient in certain vitamins
3. a man who is deficient in judgment [=a man whose judgment is poor]
4. students who are deficient [=lacking] in their knowledge of history
• not good enough
1. mentally deficient
2. Several bridges in the city are structurally deficient.