Synonyms and related words :
abandoned, acid, acidulous, acrid, acrimonious, acute, afire, ardent, assiduous, astringent, biting, bitter, burning, caustic, committed, concentrated, cutting, dedicated, delirious, desperate, devoted, devout, diligent, double-edged, drastic, earnest, edged, emphatic, energetic, enthusiastic, escharotic, excessive, exciting, exorbitant, exquisite, extravagant, extreme, faithful, fervent, fervid, fierce, fiery, flaming, forceful, frantic, furious, glowing, great, hard, hardworking, harsh, hearty, heated, hot, hot-blooded, hotheaded, immoderate, impassioned, impetuous, in earnest, incisive, indefatigable, industrious, intemperate, intense, intent, intent on, keen, laborious, lively, loyal, mordacious, mordant, never idle, on fire, outrageous, passionate, penetrating, perfervid, piercing, poignant, potent, powerful, pronounced, provoking, rabid, red-hot, relentless, resolute, rigorous, rough, scathing, sedulous, serious, severe, sharp, simmering, sincere, sleepless, spirited, splitting, stabbing, stimulating, stinging, stirring, stormy, strenuous, strident, stringent, tart, tempestuous, terrible, tireless, trenchant, unconscionable, unflagging, unremitting, unsleeping, unsparing, unwearied, urgent, venomous, vicious, violent, virulent, vitriolic, volcanic, warm, white-hot, wild, zealous