From The Collaborative International Dictionary of English v.0.44 [gcide]:
2. Extreme in degree; excessive; immoderate; as: (a) Ardent; fervent; as, intense heat. (b) Keen; biting; as, intense cold. (c) Vehement; earnest; exceedingly strong; as, intense passion or hate. (d) Very severe; violent; as, intense pain or anguish. (e) Deep; strong; brilliant; as, intense color or light.
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
212 Moby Thesaurus words for "intense": abandoned, ablaze, accentuated, active, acute, advertent, afire, aggravated, aggressive, agog, alert, all ears, all eyes, animated, ardent, assiduous, attentive, aware, boiling over, breathless, bright, bright-hued, brilliant, brisk, burning, careful, colorful, colory, committed, comprehensive, concentrated, conscious, consequential, considerable, consuming, cordial, cutting, deafening, dedicated, deep, deep-colored, delirious, desperate, devoted, devout, diligent, drastic, drunk, dynamic, eager, earnest, emotional, emphasized, energetic, enhanced, enterprising, enthusiastic, excessive, excited, excruciating, exhaustive, exorbitant, exotic, exquisite, extravagant, extreme, exuberant, faithful, fanatical, febrile, fervent, fervid, fevered, feverish, fierce, fiery, finical, finicking, finicky, flaming, flushed, forceful, forcible, frantic, frenzied, full, full of pep, furious, gay, gay-colored, glowing, go-go, gorgeous, grand, grave, great, hard, harsh, heartfelt, hearty, heated, heavy, heedful, heightened, high-colored, high-spirited, hot, hot-blooded, hotheaded, hysterical, immoderate, impassioned, impetuous, impulsive, in earnest, incisive, intemperate, intensified, intent, intent on, intentive, intoxicated, irresistible, keen, kinetic, lively, living, loud, loyal, lusty, main, maximum, meticulous, mettlesome, mighty, mindful, nervous, nice, niggling, observant, observing, on fire, on the ball, on the job, open-eared, open-eyed, openmouthed, outrageous, passionate, penetrating, peppy, perfervid, piercing, plenary, poignant, powerful, profound, pungent, red-hot, reeking, regardful, resolute, rich, rich-colored, rigorous, robust, rough, serious, severe, sharp, sincere, smacking, snappy, spanking, spirited, splitting, steaming, steamy, strenuous, stressed, strong, take-charge, take-over, temperamental, tense, terrible, testy, thundering, total, touchy, tough, trenchant, unconscionable, unrestrained, uptight, vehement, venomous, vibrant, vicious, vigorous, violent, virulent, vivacious, vivid, volatile, warm, watchful, white-hot, zealous, zestful, zesty, zippy
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