48 synonyms for intense such as committed, acute, animated, and ardent. Intense is an adjective, and its antonyms are mild and apathetic.
Acute, concentrated, consuming, deep, enormous, exceptional, extraordinary, extreme, fierce, great, harsh, high, major, potent, powerful, profound, serious, severe, strong, and vigorous.
Animated, ardent, committed, eager, earnest, emotional, energetic, enthusiastic, excited, fanatical, fervent, fervid, feverish, fiery, heartfelt, heated, hot-blooded, impassioned, keen, messianic, passionate, perfervid, spirited, strong, vehement, vigorous, and zealous.