Definition of "insufficient" in English

determiner

1. An inadequate quantity of; not enough.

   • Insufficient time is available to reflect on the problem.

2. (as pronoun) A quantity (of something) that is less than is needed.

   • Insufficient of the building remains to determine its age.

adjective

1. Not sufficient; of a type or kind that does not suffice, that does not satisfy requirements or needs.

   • an insufficient amount
   • an insufficient degree
   • It is a necessary condition but an insufficient one.

2. Not sufficient; lacking competent power or ability; unqualified, unequal, unfit.