Synonyms for Igneous (same or very similar meaning)
WordNet sense 1 (produced under conditions involving intense heat):
pyrogenic, pyrogenousWordNet sense 2 (like or suggestive of fire):
fieryWordNet sense 3 (used of physical heat; having a high or higher than desirable temperature or giving off heat or feeling or causing a sensation of heat or burning):
hotWordNet sense 4 (produced by the action of fire or intense heat):
eruptiveFrom the ODE community, based on WordNetadd/edit