inadequate

[in-ad-i-kwit] /ɪnˈæd ɪ kwɪt/
adjective
1.
not adequate or sufficient; inept or unsuitable.
2.
Psychiatry. ineffectual in response to emotional, social, intellectual, and physical demands in the absence of any obvious mental or physical deficiency.
Origin
1665–75; in-3 + adequate
Related forms
inadequately, adverb
Synonyms
1. inapt, incompetent; incommensurate; defective, imperfect, incomplete.
Antonyms
1. sufficient.
British Dictionary definitions for in adequate
inadequate (ɪnˈædɪkwɪt)
 
adj
1.  not adequate; insufficient
2.  not capable or competent; lacking
 
in'adequacy
 
n
 
in'adequately
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for in adequate
inadequate
1670s, from in- (1) + adequate.
Online Etymology Dictionary, © 2010 Douglas Harper
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