Definition of "Lifeless" :

adjective: deprived of life; no longer living

"A lifeless body."

adjective: not having the capacity to support life

"A lifeless planet."

adjective: lacking animation or excitement or activity

"It was a lifeless party until she arrived."

adjective: destitute or having been emptied of life or living beings

"After the dance the littered and lifeless ballroom echoed hollowly."