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- Dictionarydeficient/dɪˈfɪʃ(ə)nt/
adjective
- 1. not having enough of a specified quality or ingredient: "this diet is deficient in vitamin B"
- 2. having an intellectual disability. dated, offensive
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The meaning of DEFICIENT is lacking in some necessary quality or element. How to use deficient in a sentence.
lacking or not good enough: A diet that is deficient in protein is harmful to children.
not good enough: His theory is deficient in several respects. SMART Vocabulary: related words and phrases. Scarce, inadequate and not enough. be at a premium idiom. be thin on the ground idiom. chronic shortage. dearth. dearth of something.
Deficient means not enough or not adequate. Maybe you were deficient in caffeine that day. Maybe you were lacking in study time. But no doubt about it: you came up with a deficient number of correct answers on the physics test.
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.