Undisciplined (adjective)

Lacking discipline or self-control.

Origin:

Late 16th century: from un- (expressing negation) + disciplined, from latin disciplina "discipline".

Examples:

1. He was known for his undisciplined behavior and lack of punctuality.
2. The team was undisciplined and frequently lost control of the game.
3. Her undisciplined spending habits landed her in debt.
4. The students were undisciplined and disruptive in class.
5. His undisciplined approach to work often resulted in missed deadlines.