The opposite of "kept within limits" would be "exceeded boundaries" or "crossed the line." These antonyms imply going beyond what is acceptable or appropriate, indicating a lack of self-control or disregard for rules and expectations. Other antonyms include "unrestrained," "unbridled," "uncontrolled," and "unchecked," all of which suggest actions or behaviors that are impulsive, reckless, or chaotic. Conversely, words such as "moderated," "tempered," "restricted," and "regulated" reflect the idea of keeping things under control and within reasonable limits. In any context, it is essential to strike a balance between the two extremes to ensure that one's actions and behavior are appropriate and sustainable in the long term.