supple vs tough

supple

verb
  • To make or become supple. 

  • To make compliant, submissive, or obedient. 

adj
  • Lithe and agile when moving and bending. 

  • Compliant; yielding to the will of others. 

  • Pliant, flexible, easy to bend. 

tough

verb
  • To endure. 

  • To toughen. 

noun
  • A person who obtains things by force; a thug or bully. 

adj
  • Harsh or severe. 

  • Difficult or demanding. 

  • Stubborn or persistent; capable of stubbornness or persistence. 

  • Strong and resilient; sturdy. 

  • Undergoing plastic deformation before breaking. 

  • Difficult to cut or chew. 

  • Rugged or physically hardy. 

  • Rowdy or rough. 

intj
  • Used to indicate lack of sympathy 

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