unreasonable

[uhn-ree-zuh-nuh-buhl, -reez-nuh-]
adjective
1.
not reasonable or rational; acting at variance with or contrary to reason; not guided by reason or sound judgment; irrational: an unreasonable person.
2.
not in accordance with practical realities, as attitude or behavior; inappropriate: His Bohemianism was an unreasonable way of life for one so rich.
3.
excessive, immoderate, or exorbitant; unconscionable: an unreasonable price; unreasonable demands.
4.
not having the faculty of reason.

Origin:
1300–50; Middle English unresonabel. See un-1, reasonable

unreasonableness, noun
unreasonably, adverb


1, 2. senseless, foolish, silly. 2. preposterous, absurd, stupid, nonsensical. 3. extravagant.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unreasonable (ʌnˈriːznəbəl)
 
adj
1.  immoderate; excessive: unreasonable demands
2.  refusing to listen to reason
3.  lacking reason or judgment
 
un'reasonableness
 
n
 
un'reasonably
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

unreasonable
mid-14c., from un- (1) "not" + reasonable.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He often wished she would ask for something unreasonable and extravagant.
These are not unreasonable notions, but there is also no positive evidence to
  suggest that they are correct, either.
Industry advocates argue that this is not an unreasonable amount.
There is a time to jest and a time when jests are unreasonable.
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