Comparative form of 'fiery'; more fiery, hot, passionate, or intense than another.
From 'fiery' (Middle English 'firy,' from Old English 'fyr' meaning fire) with the comparative suffix -er. The adjective 'fiery' originally meant 'consisting of fire,' then expanded to mean passionate or hot-tempered.
The word 'fiery' shows how physical properties become personality traits in language—fire's literal heat becomes a metaphor for emotional intensity. This metaphor is so universal that nearly every language describes passionate people as 'hot' or 'fiery.'
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