Source : Webster's Revised Unabridged Dictionary (1913)

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

Source : WordNet®

uproarious
     adj 1: uncontrollably noisy [syn: {rackety}, {rip-roaring}]
     2: marked by or causing boisterous merriment or convulsive
        laughter; "hilarious broad comedy"; "a screaming farce";
        "uproarious stories" [syn: {hilarious}, {screaming(a)}]