life·less 
(līflĭs)
(līflĭs)adj.
1. Having no life; inanimate.
2. Having lost life; dead. See Synonyms at dead.
3. Not inhabited by living beings or capable of sustaining life: a lifeless planet.
4. Lacking vitality or animation; dull: a lifeless party.
lifeless·ly adv.
lifeless·ness n.