asymmetrical
Concise Oxford English Dictionary © 2008 Oxford University Press:
asymmetrical /asɪˈmɛtrɪk(ə)l, eɪ-/
▶adjective not symmetrical; lacking symmetry.
– derivatives
asymmetric adjective,
asymmetrically adverb.
asymmetric adjective,
asymmetrically adverb.
'asymmetrical' also found in these Oxford entries:

