inappropo vs insolent

inappropo

adj

  • Inappropriate. 

  • Not apropos. 

insolent

adj

  • Rude. 

  • Insulting in manner or words, particularly in an arrogant or insubordinate manner. 

noun

  • A person who is insolent. 

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