Definition of undisciplined in English:
Lacking in discipline; uncontrolled in behavior or manner.
- His footballing genius was never questioned, but back home he was known as an egomaniac who was undisciplined, uncontrollable and prone to flights of folly.
- As always, throwing money around in an undisciplined manner will prove to be wasteful down the road.
- These are some examples of how the modern sporting identity is typified by self-centered and undisciplined behavior.