profligate \PROF-luh-guht; -gayt\ (adjective) - 1 : Openly and shamelessly immoral; dissipated; dissolute. 2 : Recklessly wasteful.
(noun) - 1. A profligate person.
"And if the father was warm in support of his profligate son, the young medical aspirant was warmer in support of his profligate brother." -- Anthony Trollope, 'Dr. Thorne'
Profligate derives from the past participle of Latin profligatus, from profligare, to strike or fling forward, hence to the ground, from pro-, forward + fligere, to strike down.