Characterized by wild and uncontrolled behavior. The party was a riotous affair, with music blaring and people dancing on tables.
Marked by or involving public disorder. The protest turned riotous as demonstrators clashed with the police.
Having a vivid, varied, and lively appearance. The garden was a riotous display of colors, with flowers blooming in every shade imaginable.
Exuberantly abundant; luxuriant. The vines grew in riotous profusion over the old stone wall.