insufficient

An inadequate quantity of; not enough.

“Insufficient time is available to reflect on the problem.”

as pronounA quantity (of something) that is less than is needed.

“Insufficient of the building remains to determine its age.”

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

“It is a necessary condition but an insufficient one.”

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

Of a quantity not able to fulfill a need or requirement

“insufficient funds”