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1. A lack of competence
   "pointed out the insufficiencies in my report";
   - inadequacy
    
2. (pathology) inability of a bodily part or organ to function normally
    
3. Lack of an adequate quantity or number
   "the insufficiency of unemployment benefits";
   - inadequacy, deficiency

Derived forms: insufficiencies

Type of: amount, disadvantage, failing, inability, minus, unfitness, weakness

Antonym: adequacy

Encyclopedia: Insufficiency