idiosyncrasy id-ee-uh-SING-kruh-see noun WS #22

a mode of behavior or way of thought peculiar to an individual; a distinctive or peculiar feature or characteristic of a place or thing; an unusual feature of a person

1. Everyone in the office knew about the manager's idiosyncrasy of organizing meetings at exactly 3:17 PM.
2. The old building had many architectural idiosyncrasies that reflected the quirky taste of its original owner.
3. One of her charming idiosyncrasies was collecting vintage postcards from places she'd never visited.
4. The chef's idiosyncrasy of adding cinnamon to savory dishes became his signature style.
5. His idiosyncrasy of always wearing mismatched socks made him easily recognizable.