pliable vs unflappable

pliable

adj
  • Easily persuaded; yielding to influence. 

  • Soft, flexible, easily bent, formed, shaped, or molded. 

unflappable

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

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