- symmetrical, symmetric - having similarity in size, shape, and relative position of corresponding parts
Antonyms: asymmetrical, asymmetric, ill-proportioned, lopsided, one-sided, noninterchangeable, unsymmetric, unsymmetrical
- harmonious, proportionate, symmetrical - exhibiting equivalence or correspondence among constituents of an entity or between different entities
Antonyms: unbalanced, imbalanced (indirect, via balanced)