ironic vs risible

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. 

risible

adj
  • Provoking laughter; ludicrous; ridiculous; humorously insignificant 

  • Easily laughing; prone to laughter 

  • Of or pertaining to laughter 

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