impressive vs undistinguished

impressive

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

  • Appealing. 

  • Capable of being impressed. 

undistinguished

adj
  • Not distinguished: not marked by conspicuous qualities. 

  • Not distinguished: not having an air of distinction. 

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