mid-14c., "troublesome, wanton, extravagant," from Old French riotos "argumentative, quarrelsome," from riote (see riot (n.)). Meaning "tumultuous, turbulent" is mid-15c. Related: Riotously; riotousness.
their riotous blooming
riotous times
riotous living
rio
Rio de Janeiro
riot
rioter
rioting
riotous
rip
Rip Van Winkle
riparian
ripe
ripen