The meaning of DEFICIENT is lacking in some necessary quality or element. How to use deficient in a sentence.

DEFICIENT definition: lacking some element or characteristic; defective. See examples of deficient used in a sentence.

1. lacking some element or characteristic; defective. 2. inadequate. n. 3. one who is deficient, esp. one who is mentally defective.

If they're deficient in one subject, it doesn't make fiscal or pedagogical sense to hold them back in every subject.

Definition of deficient adjective from the Oxford Advanced Learner's Dictionary. deficient (in something) not having enough of something, especially something that is essential. Their food is deficient in iron. …

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.

Mar 16, 2026 · Adjective deficient (comparative more deficient, superlative most deficient) Lacking something essential; often construed with in. Synonyms: absent, poor in, void of; see also …

a person who is deficient, esp. one who is mentally defective. Synonyms: insufficient, skimpy, inadequate, meager, meagre, more... I never thought Mr. Darcy so deficient as you used <to do>. …

Deficient definition: Lacking an essential quality or element.

Deficient refers to a lack, shortage, or insufficiency of something required or desirable. This could be related to a lack in quantity, quality, amount, or degree. It can apply to various areas such as …