intense

Synonyms: acute agonizing all-consuming ardent biting bitter burning close concentrated consuming cutting deep diligent eager earnest energetic exaggerated exceptional excessive exquisite extraordinary extreme fanatical fervent fervid fierce forcible full great hard harsh heightened impassioned intensified intensive keen marked piercing powerful profound protracted pungent sharp shrill stinging strained strong supreme undue vehement violent vivid zealous

Antonyms: calm dull low-key mild moderate