blithely vs unhappily

blithely

adv
  • Without care, concern, or consideration. 

  • In a joyful, carefree manner. 

unhappily

adv
  • Through evil fate or chance; wretchedly. 

  • Without happiness; sadly. 

  • Unfortunately; regrettably. 

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