impossibility

 
Pronunciation: /ɪmˌpɒsɪˈbɪlɪti/

noun (plural impossibilities)

[mass noun]
  • the state or fact of being impossible: the impossibility of finding reliable staff
  • [count noun] an impossible thing: they believe that a world at peace is an impossibility

Origin:

late Middle English: from French impossibilite or Latin impossibilitas, from impossibilis, from in- 'not' + possibilis (see possible)