1. (noun) insufficiency, inadequacy
a lack of competence
Synonyms: inadequacy, deficiency, inadequateness, insufficiency
Antonyms: sufficiency, adequacy
2. (noun) insufficiency
(pathology) inability of a bodily part or organ to function normally
Synonyms: inadequacy, deficiency
Antonyms: adequacy, sufficiency
3. (noun) insufficiency, inadequacy, deficiency
lack of an adequate quantity or number
Synonyms: lack, inadequacy, deficiency, want, inadequateness, insufficiency
Antonyms: sufficiency, adequacy
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Synonyms and Antonyms of insufficiency 
