frighteningly vs riotously

frighteningly

adv
  • In a frightening or terrifying manner. 

  • Very; beyond usual expectation so as to cause surprise or concern. 

riotously

adv
  • In a riotous manner. 

  • In a manner that causes uncontrollable laughter. 

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