U

fiery

adjective, fier·i·er, fier·i·est.

consisting of, attended with, characterized by, or containing fire: a volcano’s fiery discharge.
intensely hot: fiery desert sands.
like or suggestive of fire: a fiery red; angry, fiery eyes.
intensely ardent, impetuous, or passionate: fiery courage; a fiery speech.
easily angered or provoked: a fiery temper.
causing a burning sensation, as certain liquors or condiments.
inflamed, as a tumor or sore.
Mining Older Use.
1. highly flammable.
2. containing highly flammable gas.

adjective fierier or fieriest

of, containing, or composed of fire
resembling fire in heat, colour, ardour, etca fiery desert wind; a fiery speaker
easily angered or arouseda fiery temper
(of food) producing a burning sensationa fiery curry
(of the skin or a sore) inflamed
flammable or containing flammable gas
(of a cricket pitch) making the ball bounce dangerously high

adj.

late 13c., 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. Related: Fieriness.