Not alive; having no life or showing no sign of living.
From Old English 'lif' (life) plus the suffix '-less' (without), creating a compound meaning 'without life.' The word has been used since Old English times to describe anything inanimate or dead.
The definition of 'lifeless' gets philosophically complicated—viruses aren't alive by most biological definitions, yet they evolve and reproduce, and some planets might harbor chemical processes so complex they blur the line between living and lifeless.
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