self-indulgent; undisciplined; slovenly
Describes a person or lifestyle that is lazy, careless, and lacking self-control; often implies moral looseness or neglect of duties.
He leads a self-indulgent life.
You can't succeed with a negligent attitude.
Compound of 自 (self) and 堕落 (depravity, corruption). The exact historical derivation is uncertain, but the word likely emerged as a way to describe self-caused moral decline.