adverb (r)

• in an unfortunate way(adv.all)

  Example:
  Sadly he died before he could see his grandchild.
  

  Synonym:
  unhappily
  Antonym:
  happily
  

  source: wordnet30
• with sadness; in a sad manner(adv.all)

  Example:
  `She died last night,' he said sadly.
  

  source: wordnet30
• in an unfortunate or deplorable manner(adv.all)

  Example:
  He was sadly neglected.
  

  Synonym:
  deplorably, lamentably, woefully
  

  source: wordnet30
• Wearily; heavily; firmly.(adverb)

  source: webster1913