extravagance

n. /ɪkˈstrævəɡəns/ C1

奢侈；铺张浪费

The habit of spending more money than is reasonable or necessary.

仙境例句

The King's one extravagance was a new crown for every trial, which he wore over his great wig.

国王唯一的奢侈，是每次审判都要戴一顶新王冠，就戴在他那顶大假发上。