undisciplined

这个班级因为学生不守纪律而经常吵闹。

The class is often noisy due to the ___undisciplined students.

他的学习方式很散漫，缺乏系统性。

His ___undisciplined study habits lack any systematic approach.

他那不受约束的行为让整个团队的工作进度受到了影响。

His ___undisciplined behavior affected the whole team's progress.