The word "art quiescent" refers to a state of quietness or inactivity in the artistic world. If you're looking to convey the opposite of this concept, there are several antonyms that may be used. For example, "art active" would refer to a state of busyness or movement in the art world. "Art dynamic" would suggest a constant and exciting change in the arts, while "art alive" would describe a thriving, robust creative environment. Other antonyms that could be used to convey the opposite of "art quiescent" include "animated," "vibrant," and "boisterous." Regardless of the specific term chosen, the antonyms for "art quiescent" all suggest a lively, active art scene.