Impossible Definition
 ĭm-pŏsə-bəl 
    adjective
  
 Incapable of having existence or of occurring.
 American Heritage 
Not capable of being, being done, or happening.
 Webster's New World 
Not capable of being done easily or conveniently.
 Webster's New World 
Not capable of being endured, used, agreed to, etc. because disagreeable or unsuitable.
 An impossible task, an impossible request.
 Webster's New World 
Unacceptable; intolerable.
 Impossible behavior.
 American Heritage 
Synonyms: 
  
    noun
  
 Wiktionary 
(uncountable) (with definite article) That which seems impossible.
 If we work together, we can achieve the impossible!
 Wiktionary 
Other Word Forms of Impossible
Noun
Singular:
 impossiblePlural:
 impossiblesOrigin of Impossible
-  From Old French impossible, from Latin impossibilis, from in- (“not”) + possibilis (“possible”), from possum (“to be able”) + suffix -ibilis (“-able”). From Wiktionary 
-  Middle English from Old French from Latin impossibilis in- not in–1 possibilis possible possible From American Heritage Dictionary of the English Language, 5th Edition 
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