caustic vs ironic

caustic

adj
  • Sharp, bitter, cutting, biting, and sarcastic in a scathing way. 

  • Capable of burning, corroding or destroying organic tissue. 

noun
  • The envelope of reflected or refracted rays for a given curve. 

  • Caustic soda. 

  • The envelope of reflected or refracted rays of light for a given surface or object. 

  • Any substance or means which, applied to animal or other organic tissue, burns, corrodes, or destroys it by chemical action; an escharotic. 

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. 

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