American Heritage Dictionary
(5)
Century Dictionary
(5)
GNU Webster's 1913
(1)
WordNet
(3)
Elsewhere on the web
His six children became unavoidably neglected and riotous, and his business, started on the wreck of the old one, again came to the brink of failure.— Under the Waves Diving in Deep Waters
Yes, it is the same Raikes; Larkyn no more--riotous no more--brandivorous no longer.— The International Magazine, Volume 2, No. 2, January, 1851
It was a howling mob, elately riotous, and already infected by the virus of the goldophobia Oh, it was good to get on deck of a night, away from this saturnalia, to watch the beacon stars strewn vastly in the skyey uplift, to listen to the ancient threnody of the outcast sea.— The Trail of '98 A Northland Romance
A riotous, evil-minded darkey, who attended to my washing, had got into a fight, and was forthwith conveyed to the Bull-pen, or military prison.— Memoirs
It did not appear to be very riotous, nor was its approach accompanied by any foaming of the water, or other indications which usually mark the approach of heavy squalls.— The Medallic History of the United States of America 1776-1876

Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about twice a month.