Meaning

adjective noisy and lacking in restraint or discipline

adjective unwilling to submit to authority

adjective of persons

originFrom Middle English unruly (“unquiet, restless”), equivalent to un- + rule + -ly (compare Middle English ruly, reuli (“subject to a religious rule, regular”)), but also representing a modified continuation of earlier Middle English unrouly, unroly (“unquiet, restless”), equivalent to un- + roolie. The latter is perhaps from or influenced by Old Norse *úróligr, related to Danish urolig…

Etymology from Wiktionary, CC BY-SA 3.0