Nonsymmetrical is an adjective that refers to something that lacks symmetry, balance or proportion. Antonyms for nonsymmetrical are words that mean the opposite of this term, such as symmetrical, balanced, proportional, harmonious, uniform, even, regular, and well-proportioned. Symmetrical, for instance, means having an equal number, size or shape of corresponding parts, while balanced refers to something that is arranged in a stable and harmonious way. Proportional means possessing the same relationship in size, degree or amount to something else. Antonyms of nonsymmetrical imply a sense of order, regularity, and proportion that are absent in nonsymmetrical things.