The antonyms for the word "most unsymmetrical" are "most symmetrical" or "most balanced." Symmetry refers to balance and proportionality in size, shape, and arrangement. When something is symmetrical, it has equal or similar parts on both sides of a central line or point. In contrast, something that is unsymmetrical is irregular, uneven, or unbalanced. The opposite of most unsymmetrical, therefore, would be most symmetrical, indicating a harmonious, proportional, and orderly arrangement. A symmetrical object or composition is aesthetically pleasing to the eye and connotes beauty, stability, and harmony.