The antonyms for the word "more improvisatory" would be words or phrases that imply structure, predictability, or rigidity. Some possible antonyms include rehearsed, planned, calculated, rehearsed, scripted, and methodical. These words imply that the performance or action is premeditated or predetermined, lacking the spontaneity and creativity that improvisation offers. Antonyms like structured, formal, and controlled also imply a certain level of constraint or limitation, suggesting that the action or performance is governed by rules or conventions. In contrast, "more improvisatory" implies a sense of freedom and flexibility, allowing for unexpected turns and innovations.