1. a lack of competence

- pointed out the insufficiencies in my report

Similar word(s): inadequacy

Definition categories: state, failing, weakness

2. (pathology) inability of a bodily part or organ to function normally

Definition categories: state, inability, unfitness

3. lack of an adequate quantity or number

Similar word(s): deficiency, inadequacy

Definition categories: attribute, amount

Sentences with insufficiency as a noun:

- The troops went hungry because of the insufficiency of their supplies.