adj. 25B6; adjective
the demonstration turned riotous : UNRULY, rowdy, disorderly, uncontrollable, unmanageable, undisciplined, uproarious, tumultuous; violent, wild, ugly, lawless, anarchic.
a riotous party : BOISTEROUS, lively, loud, noisy, unrestrained, uninhibited, uproarious, unruly, rollicking; informal rumbustious; N. Amer. informal rambunctious.
peaceable.