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adverb (r)

• with little or no delay(adv.all)

  Example:
  The rescue squad arrived promptly.
  

  Synonym:
  quick, quickly
  

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

  Example:
  He did his homework promptly.
  

  Synonym:
  pronto, readily
  

  source: wordnet30
• at once (usually modifies an undesirable occurrence)(adv.all)

  Example:
  He promptly forgot the address.
  

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

  source: webster1913