Something that is so large or plentiful that it can never be used up or finished completely.
From Latin 'in-' meaning not and 'exhaurire' meaning to draw out or empty. The word emerged in medieval English to describe boundless resources.
We call renewable energy 'inexhaustible,' but the sun will actually burn out in 5 billion years—the word reflects human perspective, not cosmic reality, showing how language captures what seems endless to short-lived creatures like us.
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