blithely vs happily

blithely

adv
  • In a joyful, carefree manner. 

  • Without care, concern, or consideration. 

happily

adv
  • In a happy or cheerful manner; with happiness. 

  • By good chance; fortunately, successfully. 

  • With good will; in all happiness; willingly. 

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