ˈrīəd.əs, -ətəs adjective
Etymology: Middle English, from riote, riot debauchery, riot + -ous — more at riot
1.
a. : practicing or marked by license or excess : profligate , wanton
b. : abundant , exuberant , profuse
a riotous display of color
riotous slapstick
2. : of the nature of a riot : marked by public uproar and disturbance : participating in riot : turbulent , seditious