Spendthriftily describes the act of spending money in a recklessly extravagant and lavish manner. It implies a lack of concern for the financial consequences of one's spending habits, often characterized by buying expensive items or engaging in luxurious activities without regard for budgeting or saving.
This behavior can lead to financial instability and difficulties. It's the opposite of being frugal or economical, highlighting an impulsive and unrestrained approach to spending.
The term often carries a negative connotation, suggesting poor financial management and a disregard for long-term financial well-being.