Etymology
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insufficient (adj.)

late 14c., from Old French insufficient (14c.) or directly from Late Latin insufficientem (nominative insufficiens) "not sufficient," from in- "not, opposite of" (see in- (1)) + sufficientem (see sufficient). Originally of persons, "inadequate, unable;" of things, "lacking in what is necessary or required," from late 15c. Related: Insufficiently.

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Definitions of insufficient

insufficient (adj.)
of a quantity not able to fulfill a need or requirement;
insufficient funds
Synonyms: deficient
From wordnet.princeton.edu