adverb (r)

• in an improper way(adv.all)

  Example:
  He checked whether the wound had healed improperly.
  

  Antonym:
  decent, decently, in good order, properly, right, the right way
  

  source: wordnet30
• In an improper manner; not properly; unsuitably; unbecomingly.(adverb)

  source: webster1913