supple vs unflappable

supple

adj
  • Lithe and agile when moving and bending. 

  • Compliant; yielding to the will of others. 

  • Pliant, flexible, easy to bend. 

verb
  • To make or become supple. 

  • To make compliant, submissive, or obedient. 

unflappable

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

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