Having the most heat or highest temperature; also means friendliest or most affectionate.
From Old English 'wearm,' related to Germanic languages and possibly Latin 'formus' (warm). The superlative form '-est' shows this is the extreme degree. The metaphorical use (warm personality) developed from physical warmth associations with comfort and affection.
Humans are 'warm-blooded' at 98.6°F, but surprisingly, this temperature is actually cooler than our evolutionary ancestors—suggesting we evolved in warmer climates. Your perception of warmth depends on context: 70°F feels warm after winter but cold after summer!
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