insufficient

det

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.”

adj

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.

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