un·fit

[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.
00:10
Unfit is always a great word to know.
So is neo-Darwinism. Does it mean:
the seas and atmosphere on earth before the existence of life, primarily containing a mixture of water, hydrogen, methane, ammonia, and carbon dioxide
any modern theory of evolution holding that species evolve by natural selection acting on genetic variation

Origin:
1535–45; un-1 + fit1

un·fit·ness, noun


1. inappropriate, unapt. 2. incapable.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
unfit (ʌnˈfɪt) [Click for IPA pronunciation guide]
 
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
He is, in theory an administrator of a budget that he screwed up in a public
  fashion and therefore unfit to administer his budget.
Anything below grade two is considered unfit for the table-and the price
  plummets accordingly.
He is unfit to manage public affairs who knows not how to rule at home his
  household.
Report the unfit condition to the applicant and offer advice on how to correct
  the unfit condition.
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