feverous vs sweltering

feverous

adj
  • having the nature of fever 

  • having a tendency to produce fever 

  • affected with fever or ague 

sweltering

adj
  • hot and humid; oppressively sticky 

noun
  • The situation of being or feeling hot and humid. 

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