asymmetric

You describe something as asymmetric when it lacks the mirror-image quality of symmetry. That dress your sister sewed for you may appear stylishly asymmetric, but really the reason the sleeves are different lengths is because she doesn’t know how to use a tape measure.

The a- prefix comes from Latin and makes a word into its opposite, so asymmetric is the opposite of symmetric. Asymmetric often describes an intentional part of a design, like a shirt with an asymmetric neckline. But it can also describe something that is the result of a mistake, injustice, or deformity, like asymmetric growth in a body, which may be a sign of disease.

Definitions of asymmetric
1

adj characterized by asymmetry in the spatial arrangement or placement of parts or components

Synonyms:
asymmetrical
irregular
contrary to rule or accepted order or general practice
lopsided
having one side lower or smaller or lighter than the other
noninterchangeable
such that the terms of an expression cannot be interchanged without changing the meaning
unsymmetric, unsymmetrical
lacking symmetry
Antonyms:
symmetric, symmetrical
having similarity in size, shape, and relative position of corresponding parts
parallel
being everywhere equidistant and not intersecting
regular
in accordance with fixed order or procedure or principle
bilateral, bilaterally symmetric, bilaterally symmetrical, isobilateral
having identical parts on each side of an axis
biradial
showing both bilateral and radial symmetry
cruciate, cruciform
shaped like a cross
even, regular
symmetrically arranged
interchangeable
(mathematics, logic) such that the arguments or roles can be interchanged
isosceles
(of a triangle) having two sides of equal length
radial, radiate, stellate
arranged like rays or radii; radiating from a common center
centrosymmetric, radially symmetrical
having a symmetrical arrangement of radiating parts about a central point
rhombohedral, trigonal
having threefold symmetry
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