adverb (r)

• with gusto and without reservation(adv.all)

  Example:
  The boy threw himself heartily into his work.
  

  source: wordnet30
• in a hearty manner(adv.all)

  Example:
  `Yes,' the children chorused heartily.
  

  Synonym:
  cordially, warmly
  

  source: wordnet30
• From the heart; with all the heart; with sincerity.(adverb)

  source: webster1913