Comparative form of warm; having more heat or being higher in temperature than something else; also means more friendly or emotional.
From Old English 'wearm,' from Proto-Germanic '*warmaz.' The figurative meaning of 'warmer' (more friendly or cordial) developed naturally from the association between physical warmth and emotional comfort.
It's no accident that 'warm' describes both temperature and kindness—neuroscience shows that when people hold warm objects or sit near heat, they actually rate others as friendlier, meaning our languages aren't just metaphorical, they're reflecting genuine connections our bodies feel.
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