Etymology
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undisciplined (adj.)

late 14c., "untrained," from un- (1) "not" + past participle of discipline (v.). Similar formation in German undisciplinirt, Swedish odisciplinerad. Specific meaning "not subject to military discipline" is attested from 1718.

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Definitions of undisciplined

undisciplined (adj.)
not subjected to discipline;
undisciplined talent
undisciplined (adj.)
not subjected to correction or discipline;
Synonyms: uncorrected
undisciplined (adj.)
lacking in discipline or control;
undisciplined behavior
Synonyms: ungoverned
From wordnet.princeton.edu