susceptibility vs weakness

susceptibility

noun
  • the condition of being susceptible; vulnerability 

  • Being vulnerable to a treatment (usually an antibiotic or antifungal); also, the degree of such vulnerability (i.e., weak, moderate, or strong). 

  • emotional sensitivity. 

  • electric susceptibility, a measure of how easily a dielectric polarizes in response to an external electric field (compare permittivity). 

weakness

noun
  • The condition of being weak. 

  • An inadequate quality; fault 

  • A special fondness or desire. 

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