adverb (r)

• with sincerity; without pretense(adv.all)

  Example:
  She praised him sincerely for his victory.
  

  Synonym:
  truly, unfeignedly
  Antonym:
  insincerely
  

  source: wordnet30
• written formula for ending a letter(adv.all)

  source: wordnet30
• In a sincere manner.(adverb)

  source: webster1913