idiosyncrasy

Universal Words noun [C,U] (plural idiosyncrasies) a person's particular way of behaving, thinking, etc., especially when it is unusual; an unusual feature SYNECCENTRICITY: Wearing a raincoat, even on a hot day, is one of her idiosyncrasies. * The car has its little idiosyncrasies. idiosyncratic adjective: His teaching methods are idiosyncratic but successful.