impossible

[im-pos-uh-buhl]
adjective
1.
not possible; unable to be, exist, happen, etc.
2.
unable to be done, performed, effected, etc.: an impossible assignment.
3.
incapable of being true, as a rumor.
4.
not to be done, endured, etc., with any degree of reason or propriety: an impossible situation.
5.
utterly impracticable: an impossible plan.
6.
hopelessly unsuitable, difficult, or objectionable.

Origin:
1250–1300; Middle English < Latin impossibilis. See im-2, possible

impossibleness, noun
impossibly, adverb

impossible, impracticable, impractical, improbable.


6. unbearable, intolerable, unmanageable.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
impossible (ɪmˈpɒsəbəl)
 
adj
1.  incapable of being done, undertaken, or experienced
2.  incapable of occurring or happening
3.  absurd or inconceivable; unreasonable: it's impossible to think of him as a bishop
4.  informal intolerable; outrageous: those children are impossible
 
im'possibleness
 
n
 
im'possibly
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
It's kind of impossible not to notice the weird emphasis on cleaning here.
They are lots of fun, but getting good results can often range from frustrating
  to impossible.
In practice, marshalling the efforts of laboratories across the world to do
  that would be an impossible task.
At that level of density, sinking in quicksand is impossible.
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