indecent vs strengthening

indecent

adj
  • Offensive to good taste. 

  • Generally unacceptable for public broadcasting but not legally obscene. 

  • Not in keeping with conventional moral values; improper, immodest, or unseemly. 

strengthening

noun
  • The process by which something is strengthened. 

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