fortuitously vs unhappily

fortuitously

adv
  • In a fortuitous manner; in a manner of happening by chance; coincidentally; accidentally. 

  • In a fortuitous manner; in a manner of happening by a lucky chance; luckily; fortunately. 

unhappily

adv
  • Through evil fate or chance; wretchedly. 

  • Without happiness; sadly. 

  • Unfortunately; regrettably. 

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