not sufficient; lacking in what is necessary or required: an insufficient answer.
deficient in force, quality, or amount; inadequate: insufficient protection.

Origin of insufficient

1350–1400; Middle English < Late Latin insufficient- (stem of insufficiēns). See in-3, sufficient
Related formsin·suf·fi·cient·ly, adverb

Synonyms for insufficient Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for insufficiently

inadequately, incompletely, partly

Examples from the Web for insufficiently

Contemporary Examples of insufficiently

Historical Examples of insufficiently

  • "A friend of ours did think that it is insufficiently reinsured," said Margaret.

    Howards End

    E. M. Forster

  • Another returned it insufficiently stamped, and there was fourpence to pay.

    A Great Man

    Arnold Bennett

  • She had been insufficiently clad in winter, too heavily clad in summer.

    Mary Gray

    Katharine Tynan

  • Indeed the whole character of Jane is insufficiently presented.

  • Of the 'Apollo' it is argued that it is insufficiently modelled.

    Ave Roma Immortalis, Vol. 2

    Francis Marion Crawford

British Dictionary definitions for insufficiently



not sufficient; inadequate or deficient
Derived Formsinsufficiently, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for insufficiently



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

Online Etymology Dictionary, © 2010 Douglas Harper

insufficiently in Medicine




Not sufficient.
Incapable of proper functioning.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.