in ‧ dis ‧ ci ‧ pline /ɪnˈdɪsəplən, ɪnˈdɪsɪplən/ BrE AmE noun [uncountable] formal
a lack of control in the behaviour of a group of people, with the result that they behave badly OPP discipline :
Indiscipline among the troops eventually led to a riot.