The Collaborative International Dictionary of English v.0.48:

Uproarious \Up*roar"i*ous\, a.
   Making, or accompanied by, uproar, or noise and tumult; as,
   uproarious merriment.
   [1913 Webster] -- Up*roar"i*ous*ly, adv. --
   Up*roar"i*ous*ness, n.
   [1913 Webster]