Demosthenic vs impressive

Demosthenic

adj
  • Pertaining to or characteristic of Demosthenes, a celebrated Athenian orator (384-322, B.C.), especially famous for his "Phillippics," or orations delivered against the encroachments of Philip, king of Macedon. 

impressive

adj
  • Appealing. 

  • Capable of being impressed. 

  • Making, or tending to make, a positive impression; having power to impress 

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