Pronunciation: (rī'u-tus),[key] —adj. 1. (of an act) characterized by or of the nature of rioting or a disturbance of the peace.
2. (of a person) inciting or taking part in a riot.
3. given to or marked by unrestrained revelry; loose; wanton: riotous living. 4. boisterous or uproarious: riotous laughter. 5. hilariously funny.