infirm vs unsteady

infirm

adj
  • Irresolute; weak of mind or will. 

  • Weak or ill, not in good health. 

  • Frail; unstable; insecure. 

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

unsteady

adj
  • Inconstant in purpose, or volatile in behavior. 

  • Lacking regularity or uniformity. 

  • Not held firmly in position, physically unstable. 

verb
  • To render unsteady, removing balance. 

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