overwhelm vs underwhelm

overwhelm

verb
  • To overpower emotionally. 

  • To cause to surround, to cover. 

  • To engulf, surge over and submerge. 

  • To overpower, crush. 

noun
  • The state or condition of being overwhelmed. 

underwhelm

verb
  • To fail to impress; to perform disappointingly. 

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