Antonyms for Symmetry | Symmetry at Open Dictionary of English by LearnThat Foundation

Antonyms for Symmetry (opposite meaning)

WordNet sense 1 (lack of proportion; imbalance among the parts of something):

disproportion

WordNet sense 2 ((mathematics) a lack of symmetry):

asymmetry

WordNet sense 3 (the property of being anisotropic; having a different value when measured in different directions):

anisotropy

From the ODE community, based on WordNetadd/edit