dead or appearing to be dead:
Anton's lifeless body was found floating in the lake.
lacking the positive qualities that make something or someone interesting, exciting, or active [≠ lively]:
The actors' performances were lifeless.
not living, or not having living things on it:
The surface of the moon is arid and lifeless.
lifeless hair or skin is in bad condition and does not look healthy [= dull]
—lifelessness noun [uncountable]