symmetry + -ical

source: Such perfect symmetry... wait, no! | Soul Eater | Know Your Meme

made up of exactly similar parts facing each other or around an axis; showing symmetry:

左右対称の, 対称的な(↔ asymmetric(asymmetrical))

e.g. the shape of a hill, smooth and symmetrical.

symmetrically |səˈmetrək(ə)lē| adverb