exhilarant vs unenthusiastic

exhilarant

adj

  • Exciting joy, mirth, or pleasure. 

noun

  • That which exhilarates. 

unenthusiastic

adj

  • Without enthusiasm; unexcited. 

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