incoherent vs lethetic

incoherent

adj
  • Not making logical sense; not logically connected or consistent. 

  • Not cohering socially, not united. 

lethetic

adj
  • Failing to mirror reality, purely escapist or nonsensical. 

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