The phrase "sits still for" implies a state of calm and compliance, but its antonyms suggest a lack of cooperation and restlessness. Some possible antonyms for this phrase include "fidgets," "squirms," "bounces," "wiggles," "restlessly moves," and "struggles against." These antonyms may apply to a child who cannot sit still during a lesson or a pet who resists being still for a photo. Other antonyms for "sits still for" might include "resists," "defies," "rebels against," "opposes," and "disobeys." These words evoke a sense of defiance and rebellion, emphasizing the inability or unwillingness to comply.