unfit

[uhn-fit]
adjective
1.
not fit; not adapted or suited; unsuitable: He was unfit for his office.
2.
unqualified or incompetent.
3.
not physically fit or in due condition.
4.
Biology. pertaining to an organism or population that is not adapted to prevailing conditions or is not producing offspring in sufficient numbers to maintain its contribution to the gene pool of the next generation.
verb (used with object)
5.
to render unfit or unsuitable; disqualify.

Origin:
1535–45; un-1 + fit1

unfitness, noun


1. inappropriate, unapt. 2. incapable.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unfit (ʌnˈfɪt)
 
adj (often foll by for) (often foll by for)
1.  unqualified, incapable, or incompetent: unfit for military service
2.  unsuitable or inappropriate: the ground was unfit for football
3.  in poor physical condition
 
un'fitness
 
n

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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Etymonline
Word Origin & History

unfit
1545, "not suitable" (in ref. to things), from un- (1) "not" + pp. of fit (see fit (adj.)). In ref. to persons or human qualities, attested from 1551. The verb meaning "to render unfit" is recorded from 1611.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
By these perfidies, he has verily shewn himself to be unfit to rule a free
  people.
There is no question the program was right to remove this unfit counselor.
The healthy-or those who aspire to be-can't really understand the unfit.
Maybe, she wonders, there's something about me that makes me unfit for any kind
  of job.
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