adverb (r)

• without animation or vitality(adv.all)

  Example:
  Lifelessly he performed the song.
  

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

  Example:
  The girl lay in her arms lifelessly.
  

  source: wordnet30
• as if dead(adv.all)

  Synonym:
  deadly
  

  source: wordnet30