Her tendency to bite her lip is an idiosyncrasy.

Idiosyncrasy is the correct spelling of this word.


Some example sentences are:
Idiosyncrasy is behaviour that is seen as peculiar or abnormal.

His worse idiosyncrasy is repeating every word that is said to him.

No, provided one does not confuse an idiosyncrasy with a pathological antisocial behavioral disorder.

You mispelled it. It's idiosyncrasy. Uncle Johnny had many idiosyncrasies such as talking too loudly, laughing too loudly, and telling long detailed stories which put everyone to sleep before he finished. Dorie

commonality.