WEBadjective. (of an act) characterized by or of the nature of rioting or a disturbance of the peace. (of a person) inciting or taking part in a riot. given to or marked by unrestrained revelry; loose; wanton: riotous living. boisterous or uproarious: riotous laughter. hilariously funny. riotous. / ˈraɪətəs / adjective.