lassitude vs unease

lassitude

noun
  • Listlessness or languor. 

  • Lethargy or lack of energy; fatigue. 

unease

noun
  • Trouble; misery; a feeling of disquiet or concern. 

verb
  • To make uneasy or uncomfortable 

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