spendthrift
她是个挥霍无度的人，总是把工资花在奢侈品上。
She is such a ___spendthrift that she always blows her salary on luxury items.
她是个挥霍无度的人，总是买些根本不需要的昂贵物品。
She is such a ___spendthrift, always buying expensive things she doesn't even need.
他真是个败家子，一个月就花光了半年的工资。
He is such a ___spendthrift that he blew through half a year's salary in one month.