diffusive vs ephemeral

diffusive

adj
  • That diffuses something; disseminating. 

  • That is spread or dispersed across a wide area or among a large number of people. 

  • Involving or employing many words; expansive, discursive; (in negative sense) long-winded. 

  • Pertaining to diffusion. 

ephemeral

adj
  • Usually dry, but filling with water for brief periods during and after precipitation. 

  • Lasting for a short period of time. 

  • Existing for only one day, as with some flowers, insects, and diseases. 

noun
  • Something which lasts for a short period of time. 

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