disregard vs listlessness

disregard

noun
  • The act or state of deliberately not paying attention or caring about; misregard. 

verb
  • To ignore; pay no attention to. 

listlessness

noun
  • The state of being listless; apathetic indifference; lethargy. 

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