frustrate vs underwhelm

frustrate

verb
  • To disappoint or defeat; to vex by depriving of something expected or desired. 

  • To cause stress or annoyance. 

  • To hinder or thwart. 

adj
  • ineffectual; useless; fruitless. 

underwhelm

verb
  • To fail to impress; to perform disappointingly. 

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