in·suf·fi·cient

[in-suh-fish-uhnt]
adjective
1.
not sufficient; lacking in what is necessary or required: an insufficient answer.
2.
deficient in force, quality, or amount; inadequate: insufficient protection.

Origin:
1350–1400; Middle English < Late Latin insufficient- (stem of insufficiēns). See in-3, sufficient

in·suf·fi·cient·ly, adverb


1. inadequate, scanty, deficient.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
insufficient (ˌɪnsəˈfɪʃənt) [Click for IPA pronunciation guide]
 
adj
not sufficient; inadequate or deficient
 
insuf'ficiently
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Insufficient is always a great word to know.
So is lollapalooza. Does it mean:
a stew of meat, vegetables, potatoes, etc.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
Etymonline
Word Origin & History

insufficient
late 14c., from O.Fr. insufficient, from L. insufficientem (nom. insufficiens), from in- "not" + sufficientem (see sufficient). Originally of persons, "inadequate, unable;" of things, from 1494.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

insufficient in·suf·fi·cient (ĭn'sə-fĭsh'ənt)
adj.

  1. Not sufficient.

  2. Incapable of proper functioning.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
At the beginning its leaves were plagued with white spots, which the
  researchers chalked up to insufficient nutrients.
The help page on this topic was insufficient to help me find the right folder
  or the folder does not exist.
First, consider that a three month emergency fund may be insufficient.
The second could be that there is insufficient demand.
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