The phrase "be within control" refers to the ability to manage, regulate, or influence a situation or object. Its antonyms, or words with the opposite meaning, include terms such as "out of control" or "unmanageable." These indicate a lack of regulation or authority over a situation or object. Other antonyms for "be within control" include "chaotic," "disorganized," "wild," "erratic," and "unpredictable." These words suggest a state of disorder, where things are not under control, and unpredictability reigns. Thus, having control over a situation or object is essential for achieving stability, order, and predictability.