Definitions of lifeless:

• adjective:   deprived of life; no longer living

  Example: "A lifeless body"

• adjective:   not having the capacity to support life

  Example: "A lifeless planet"

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

  Example: "After the dance the littered and lifeless ballroom echoed hollowly"

• adjective:   lacking animation or excitement or activity

  Example: "It was a lifeless party until she arrived"