Etymology
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fiery (adj.)

late 13c., "flaming, full of fire," from Middle English fier "fire" (see fire (n.)) + -y (2). The spelling is a relic of one of the attempts to render Old English "y" in fyr in a changing system of vowel sounds. Other Middle English spellings include firi, furi, fuiri, vuiri, feri. From c. 1400 as "blazing red." Of persons, from late 14c. Related: Fieriness. As adjectives Old English had fyrbære "fiery, fire-bearing;" fyren "of fire, fiery, on fire;" fyrenful; fyrhat "hot as fire."

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Definitions of fiery

fiery (adj.)
characterized by intense emotion;
fiery oratory
fiery (adj.)
like or suggestive of fire;
a fiery desert wind
Synonyms: igneous
fiery (adj.)
very intense;
a fiery temper
Synonyms: flaming
From wordnet.princeton.edu