prodigal

A prodigal person, a spendthrift.

Wastefully extravagant.

“He found himself guilty of prodigal spending during the holidays.”

(often followed by of or with) Yielding profusely, lavish.

“How can he be so prodigal with money on such a tight budget?”

Profuse, lavishly abundant.

(by allusion to the Biblical parable of the prodigal son) returning after abandoning a person, group, or ideal, especially for selfish reasons; behaving as a prodigal son.