Definition of lifeless adjective from the Oxford Advanced American Dictionary

     

    lifeless

     adjective
    adjective
    NAmE//ˈlaɪfləs//
     
     
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  1. 1(formal) dead or appearing to be dead synonym inanimate He knelt beside her lifeless body.
  2. 2not living; not having living things growing on or in it lifeless machines a lifeless planet
  3. 3dull; lacking the qualities that make something or someone interesting and full of life synonym lackluster his lifeless performance on stage Her hair was lifeless and uncombed.
See the Oxford Advanced Learner's Dictionary entry: lifeless