amiably vs happily

amiably

adv
  • In an amiable manner; in a friendly or pleasant manner. 

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 amiably and happily occurred in a corpus of books? (source: Google Ngram Viewer )