extravagance
noun uk/ɪkˈstræv.ə.ɡəns/ us/ɪkˈstræv.ə.ɡəns/
[ U ]奢侈，铺张
behaviour in which you spend more money than you need to
I think she was shocked by my extravagance. 我想，我太铺张了，她一定感到很震惊。
[ C ]奢侈品，奢华物
something expensive that you buy even though you do not need it
Perfume is my greatest extravagance. 香水是我最大的奢侈品。