Most contained refers to a state where something is under control or confined within set boundaries. Antonyms for this phrase would imply that something is not contained, out of control or moving beyond certain limits. Uncontrolled, undisciplined, wild, unrestrained, unbounded, rampant, free, unfettered, unchecked, uncurbed, sprawling, unfenced, and exorbitant are some of the antonyms that can be used for the phrase "most contained." These words suggest a lack of control or boundaries, which can lead to negative outcomes in different areas of life. It is important to maintain a balance between control and freedom to achieve optimal results in any given situation.