embroil vs unsettle

embroil

verb
  • To draw into a situation; to cause to be involved. 

  • To implicate in confusion; to complicate; to jumble. 

unsettle

verb
  • To bring into disorder or disarray 

  • To make upset or uncomfortable 

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