ironic vs tongue-in-cheek

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. 

tongue-in-cheek

adj
  • Not intended seriously; jocular or humorous. 

adv
  • With irony. 

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