undisciplined
🇺🇸
/ˌʌnˈdɪsəplɪnd/
🇬🇧
/ˌʌnˈdɪsəplɪnd/
Lacking self-control or order; behaving poorly
The teacher was frustrated with the undisciplined behavior of the students during class.
선생님은 수업 중 학생들의 무질서한 행동에 실망했습니다.