<p><strong>Adjective</strong></p><ul><li>not endowed with life; having no life; inanimate: lifeless matter.</li><li>Synonyms: inorganic</li><li>Antonyms: living</li><li>destitute of living things: a lifeless planet.</li><li>deprived of life; dead: a battlefield strewn with lifeless bodies.</li><li>Synonyms: defunct</li><li>Antonyms: living</li><li>without animation, liveliness, or spirit; dull; colorless; torpid: a lifeless performance of a play.</li><li>Synonyms: spiritless, sluggish, passive, inert, inactive</li><li>Antonyms: lively</li><li>insensible, as a person who has fainted.</li></ul>