garble vs speak unclearly

garble

noun
  • Confused or unintelligible speech. 

verb
  • To pick out such parts (of a text) as may serve a purpose; to mutilate; to pervert 

  • To make false by mutilation or addition 

speak unclearly

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