turbid vs uncognoscible

turbid

adj
  • Unclear; confused; obscure. 

  • Having the lees or sediment disturbed; not clear. 

  • Smoky or misty. 

uncognoscible

adj
  • Synonym of incognoscible 

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