astonishingly vs stupendously

astonishingly

adv
  • In an astonishing manner; so as to surprise or astonish. 

  • Very; remarkably used as an intensifier. 

stupendously

adv
  • In a stupendous manner. 

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