[syn: boisterous, fierce, rough]
The Collaborative International Dictionary of English v.0.48:
Boisterous \Bois"ter*ous\, a. [OE. boistous; of uncertain
   origin; cf. W. bwyst wild, savage, wildness, ferocity,
   bwystus ferocious.]
   1. Rough or rude; unbending; unyielding; strong; powerful.
      [Obs.] "Boisterous sword." "Boisterous hand." --Shak.
      [1913 Webster]
   2. Exhibiting tumultuous violence and fury; acting with noisy
      turbulence; violent; rough; stormy.
      [1913 Webster]
            The waters swell before a boisterous storm. --Shak.
      [1913 Webster]
            The brute and boisterous force of violent men.
                                                  --Milton.
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   3. Noisy; rough; turbulent; as, boisterous mirth; boisterous
      behavior.
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            I like not that loud, boisterous man. --Addison.
      [1913 Webster]
   4. Vehement; excessive. [R.]
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            The heat becomes too powerful and boisterous for
            them.                                 --Woodward.
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   Syn: Loud; roaring; violent; stormy; turbulent; furious;
        tumultuous; noisy; impetuous; vehement.
        [1913 Webster]
WordNet (r) 3.0 (2006):
boisterous
    adj 1: noisy and lacking in restraint or discipline; "a
           boisterous crowd"; "a social gathering that became
           rambunctious and out of hand"; "a robustious group of
           teenagers"; "beneath the rumbustious surface of his
           paintings is sympathy for the vulnerability of ordinary
           human beings"; "an unruly class" [syn: boisterous,
           rambunctious, robustious, rumbustious, unruly]
    2: full of rough and exuberant animal spirits; "boisterous
       practical jokes"; "knockabout comedy" [syn: boisterous,
       knockabout]
    3: violently agitated and turbulent; "boisterous winds and
       waves"; "the fierce thunders roar me their music"- Ezra
       Pound; "rough weather"; "rough seas" [syn: boisterous,
       fierce, rough]
Moby Thesaurus II by Grady Ward, 1.0:
64 Moby Thesaurus words for "boisterous":
   blaring, blatant, blatting, blustering, blusterous, blustery,
   brassy, brawling, brazen, bullying, clamant, clamorous,
   clamoursome, clanging, clangorous, clattery, disorderly, exuberant,
   harum-scarum, hectoring, knock-down-and-drag-out, knockabout,
   lively, loudmouthed, mafficking, multivocal, noiseful, noisy,
   obstreperous, openmouthed, rackety, raging, rambunctious,
   rampageous, ranting, raucous, raving, riotous, rip-roaring,
   roistering, roisterous, rollicking, rough, rough-and-tumble, rowdy,
   rowdyish, storming, stormy, strepitant, strepitous, strident,
   swaggering, swashbuckling, swashing, tempestuous, termagant,
   tumultuous, turbulent, undisciplined, unruly, uproarious,
   vociferant, vociferous, wild