asymmetry
US /eɪˈsɪm.ə.tri/
UK /eɪˈsɪm.ə.tri/

1.
lack of equality or equivalence between corresponding parts or aspects of something; lack of symmetry.
:
•
The architect intentionally designed the building with a striking asymmetry.
•
The slight asymmetry in her smile made her even more charming.