bad humour vs disgruntlement

bad humour

noun
  • a state of irritability or surliness 

  • irritability or surliness 

disgruntlement

noun
  • The state of being disgruntled, usually displayed in a stereotypical form such as frowning and annoyance; the acts of sulky dissatisfaction. 

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