adverb (r)

• without care or concern(adv.all)

  Example:
  Carelessly raised the children's hopes without thinking of their possible disappointment.
  

  Synonym:
  heedlessly
  

  source: wordnet30
• without caution or prudence(adv.all)

  Example:
  One unfortunately sees historic features carelessly lost when estates fall into unsympathetic hands.
  

  Synonym:
  incautiously
  Antonym:
  carefully, cautiously
  

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

  Synonym:
  raffishly, rakishly
  

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

  source: webster1913