ironic vs mordacious

ironic

adj
  • Done in an insincere and mocking manner; satirical. 

  • Acting in a unserious and teasing manner. 

  • Odd or coincidental; strange. 

  • Characterized by or constituting (any kind of) irony. 

mordacious

adj
  • Sharp in intent, sarcastic 

  • Prone to biting, aggressive (of an animal etc.). 

  • Biting, causing a physical bite or sting; corrosive 

  • sharp or caustic in style or tone. 

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