Full of heat; hot or producing much heat; intense and passionate.
From 'heat' + '-ful' (Old English '-full,' meaning full of or characterized by). '-ful' is one of the most productive English suffixes for creating adjectives from nouns.
'-ful' words are interesting because they're half-metaphorical—'heatful' could mean literally hot or figuratively passionate, and a 'heatful' argument is one where people's emotional temperatures rise. The word works on both levels simultaneously.
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