Volcanic :  adj
1: relating to or produced by or consisting of volcanoes; "volcanic steam"; "volcanic islands such as Iceland"; "a volcanic cone is a conical mountain or hill built up of material from volcanic eruptions"
2: explosively unstable; "a volcanic temper"
3: igneous rock produced by eruption and solidified on or near the earth's surface; rhyolite or andesite or basalt; "volcanic rock includes the volcanic glass obsidian" [syn: eruptive] ... ( more )

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agitable, bursting, combustible, detonating, edgy, emotional, emotionally unstable, eruptive, excitable, explodable, explosible, explosive, fierce, fiery, fulminating, furious, hasty, high-mettled, high-spirited, high-strung, highly emotional, hot, hot-tempered, hotheaded, impetuous, inflammable, irascible, irritable, mettlesome, nervous, passionate, peppery, perturbable, prickly, quick, quick-tempered, sensitive, short-tempered, simmering, skittish, spunky, startlish, stormy, tempestuous, tornadic, touchy, vehement, violent, wild,