na-adjective
symmetrical
Describes something that is balanced or has corresponding parts on opposite sides. Often used in geometry, design, and abstract comparisons.
この建物は左右対称的だ。
This building is bilaterally symmetrical.
彼の意見は私のと対称的だった。
His opinion was the mirror image of mine.
左右対称 specifically means 'bilateral symmetry', whereas 対称的 is a broader term for anything symmetrical.
From 対称 (symmetry) + 的 (adjectival suffix).