enthusiastic vs unflappable

enthusiastic

adj
  • With zealous fervor; excited, motivated. 

  • Relating to enthusiasm, or divine possession. 

unflappable

adj
  • Remaining composed and level-headed at all times; impossible to fluster; not becoming frustrated or irritated easily. 

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