insufficient /ɪnsəˈfɪʃənt/adjective 2determiner 2forms 2 adjective2 •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.Brother Cosroe, I find my selfe agreeu’d, Yet insufficient to expresse the same: For it requires a great and thundering speech: […] — 1587 determiner2 •An inadequate quantity of; not enough.Insufficient time is available to reflect on the problem. •A quantity (of something) that is less than is needed.Insufficient of the building remains to determine its age. formsmore insufficient · most insufficient