spendthrift

/ˈspendθrɪft/ adjective

Definition

› in the habit of spending too much money without thinking about the results: These were clear signals to change our spendthrift ways. Company finance directors and spendthrift shoppers alike have reason to hope that energy prices will be more manageable in the coming year. In spite of the housing slowdown, the American consumer remained cheerfully spendthrift.

(Definition of spendthrift adjective from the Cambridge Business English Dictionary © Cambridge University Press)