easy vs refractory

easy

adj
  • Not making resistance or showing unwillingness; tractable; yielding; compliant. 

  • Consenting readily to sex. 

  • Free from constraint, harshness, or formality; unconstrained; smooth. 

  • Requiring little skill or effort. 

  • Comfortable; at ease. 

  • Causing ease; giving comfort, or freedom from care or labour. 

adv
  • In a relaxed or casual manner. 

  • In a manner without strictness or harshness. 

  • At the very least. 

verb
  • Synonym of easy-oar 

noun
  • Something that is easy. 

refractory

adj
  • Obstinate and unruly; strongly opposed to something. 

  • Not affected by great heat. 

  • Difficult to treat. 

  • Incapable of registering a reaction or stimulus. 

noun
  • A material or piece of material, such as a brick, that has a very high melting point. 

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