cloudy vs unbeknown

cloudy

adj
  • Uncertain; unclear. 

  • Using or relating to cloud computing. 

  • Containing pith 

  • Not transparent or clear. 

  • Covered with or characterised by clouds; overcast. 

unbeknown

adj
  • Not beknown. 

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