un·rea·son·a·ble

[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

un·rea·son·a·ble·ness, noun
un·rea·son·a·bly, adverb


1, 2. senseless, foolish, silly. 2. preposterous, absurd, stupid, nonsensical. 3. extravagant.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To unreasonable
00:10
Unreasonable is always a great word to know.
So is flibbertigibbet. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a chattering or flighty, light-headed person.
Collins
World English Dictionary
unreasonable (ʌnˈriːznəbəl) [Click for IPA pronunciation guide]
 
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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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.
To them, what you require is genuinely unreasonable.
While this is not a scientific reason, it is not unreasonable to imagine that
  many scientists hold this view.
Continuing to campaign while taking them doesn't seem unreasonable.
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