boisterous (adj.)

late 15c., "rough, coarse," unexplained alteration of Middle English boistous (c. 1300) "rough, coarse, clumsy, violent," which is of unknown origin, perhaps from Anglo-French bustous "rough (road)," which is perhaps from Old French boisteos "curved, lame; uneven, rough" (Modern French boiteux), itself of obscure origin. Another guess traces it via Celtic to Latin bestia.

Of persons, "turbulent, clamorous," 1560s; "Orig. in a distinctly bad sense, but gradually passing into ... [']Abounding in rough but good-natured activity bordering upon excess[']" [OED] by 1680s. Related: Boisterously; boisterousness.

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Definitions of boisterous from WordNet

boisterous (adj.)
noisy and lacking in restraint or discipline;
a boisterous crowd
Synonyms: rambunctious / robustious / rumbustious / unruly
boisterous (adj.)
full of rough and exuberant animal spirits;
boisterous practical jokes
Synonyms: knockabout
boisterous (adj.)
violently agitated and turbulent; "the fierce thunders roar me their music"- Ezra Pound;
boisterous winds and waves
Synonyms: fierce / rough