idiosyncrasy

Noun B2 – Upper-Intermediate

A distinctive habit or way of behaving that is particular to one person.

"One of his idiosyncrasies is that he refuses to eat food that touches other food on the plate."

"Idiosyncrasy" describes a personal quirk, while "idiosyncratic" is the adjective used to describe a person or style that has many such quirks.

Synonyms

quirk peculiarity