bad humour vs despondency

bad humour

noun

  • a state of irritability or surliness 

  • irritability or surliness 

despondency

noun

  • A feeling of depression or disheartenment. 

  • The loss of hope or confidence; despair or dejection. 

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