One of the mysteries of the English language finally explained.
1Extremely cold; devoid of heat (sometimes with connotations of death). Compare "stone-cold". In later use chiefly literary.
2Figurative. Entirely devoid of warmth of feeling; without zeal or fervour. Now rare.
Early 16th century; earliest use found in Thomas More (1478–1535), lord chancellor, humanist, and martyr. From key + cold.
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