insufficient

1. An inadequate quantity of; not enough.

   Insufficient time is available to reflect on the problem.

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

   Insufficient of the building remains to determine its age.

comparative more insufficient · superlative most insufficient

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

   an insufficient amount

   2 more examples

   an insufficient degree

   It is a necessary condition but an insufficient one.

   Synonyms: unsufficient, deficient, lacking

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

   Brother Coſroe, I find my ſelfe agreeu’d, Yet inſufficient to expreſſe the ſame: For it requires a great and thundering ſpeech: […]

   c. 1587–1588 (date written), [Christopher Marlowe], Tamburlaine the Great. […] The First Part […], 2nd edition, part 1, London: […] [R. Robinson for] Richard Iones, […], published 1592, →OCLC; reprinted as Tamburlaine the Great (A Scolar Press Facsimile), Menston, Yorkshire; London: Scolar Press, 1973, →ISBN, Act I, scene i

   Synonyms: unsufficient