incapable vs insupposable

incapable

adj
  • Not capable (of doing something); unable. 

  • Not in a state to receive; not receptive; not susceptible; not able to admit. 

insupposable

adj
  • Incapable of being supposed; inconceivable. 

How often have the words incapable and insupposable occurred in a corpus of books? (source: Google Ngram Viewer )