lightheartedly vs unhappily

lightheartedly

adv
  • In a lighthearted manner, cheerfully, with joy. 

unhappily

adv
  • Through evil fate or chance; wretchedly. 

  • Without happiness; sadly. 

  • Unfortunately; regrettably. 

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