impotent vs infirm

impotent

adj
  • lacking physical strength or vigor; weak 

  • incapable of sexual intercourse, often because of an inability to achieve or sustain an erection, having impotentia coeundi 

  • lacking in power, as to act effectively; helpless 

  • sterile 

noun
  • a man who has erectile dysfunction 

  • an impotent or powerless person 

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 impotent and infirm occurred in a corpus of books? (source: Google Ngram Viewer )