What's the opposite of the word symmetry?

[chinois]

It's not dis-symmetry...

[Haggisdj]

Lop-sided ??

[Nephilim]

It's asymmetry.

[felinechums]

asymmetry

[Octavius]

assymetry or assymetrical means 'lacking in symmetry' so in the same context it could be that, or it could be lopsided, askew, irregular, imbalanced, ill-proportioned, one-sided or even unsymmetric.

[Quizmonkey]

Call me pedantic Octavius but it can't be any of them as they're all adjectives and the questioner is looking for a noun :) The true antonym is asymmetry.

[Octavius]

What you mean like the first word in my answer????

[danube]

Opposite of symmetry could be 'disproportion' or 'disharmony'.

What about 'malformation'?

Three to chew over.

[chinois]

Thank you, asymmetry was the word i was after! I knew it wasnt unsymmetry or dissymmetry...