painless vs tiring

painless

adj
  • Free from pain; without pain or trouble. 

  • Not difficult; easy. 

tiring

noun
  • Bits of bone and tough organic material from a corpse given to hawks to abate their hunger. 

  • The action of tiring. 

adj
  • That tires or tire. 

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