fitted vs infirm

fitted

verb
  • simple past tense of fit ("to tailor, to change size") 

  • simple past tense of fit (other senses) 

adj
  • Incorporating all of the fittings into connected units. 

infirm

adj
  • Weak or ill, not in good health. 

  • Irresolute; weak of mind or will. 

  • Frail; unstable; insecure. 

verb
  • To contradict, to provide proof that something is not. 

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