an act of extravagance

Translations
акт расточительности
Buying a sports car was an act of extravagance he couldn't afford.
Покупка спортивного автомобиля была актом расточительности, который он не мог себе позволить.
Definitions
An act of extravagance refers to a behavior or action characterized by excessive spending, lavishness, or indulgence, often beyond what is considered reasonable or necessary.