Definition of impossible adjective from the Oxford Advanced American Dictionary

      

    impossible

     adjective
    adjective
    NAmE//ɪmˈpɑsəbl//
     
     
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  1. 1that cannot exist or be done; not possible almost/virtually impossible It's impossible for me to be there before eight. It's impossible to prove. Ifind it impossible to lie to her. an impossible dream/goal opposite possible
  2. 2very difficult to deal with I've been placed in an impossible position. Honestly, you're impossible at times!
  3. 3the impossible noun [singular] a thing that is or seems impossible to attempt the impossible
impossibility
 
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NAmE//ɪmˌpɑsəˈbɪlət̮i//
 
noun (pl. impossibilities) [uncountable, countable, usually singular] the sheer impossibility of providing enough food for everyone a virtual impossibility
NAmE//ɪmˈpɑsəbli//
 
adverb an impossibly difficult problem (= impossible to solve) He was impossibly handsome (= it was difficult to believe that he could be so handsome ).
See the Oxford Advanced Learner's Dictionary entry: impossible