undisciplined

adjective

1. having or exhibiting discipline; rigorous: paintings characterized by a disciplined technique.

adjective

1. not exhibiting self-control or good behaviour

adj.late 14c., “untrained,” from un- (1) “not” + past participle of discipline (v.). Cf. German undisciplinirt, Swedish odisciplinerad. Specific meaning “not subject to military discipline” is attested from 1718.