He found himself guilty of prodigal spending during the holidays.
2
(often followed by of or with) Yielding profusely, lavish.
How can he be so prodigal with money on such a tight budget?
3
Profuse, lavishly abundant.
4
(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.