Definitions

1. adjective

given to or characterized by a fondness for or a tendency to indulge in foolish or extravagant behavior

“The young artist’s folious spending habits on clothes and gadgets left her parents worried.”

2. noun

a foolish or extravagant person, especially one prone to indulging in excessive or luxurious behavior

“He’s always been a bit of a folious, buying expensive jewelry and cars on impulse.”