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adj. 1. Loud or noisy and lively or unrestrained: a boisterous street market. See Synonyms at vociferous. 2. Rough and stormy; violent: boisterous winds; a boisterous voyage. [Middle English boistres, variant of boistous, rude, rough, perhaps from Old French boisteus, lame, limping, from boiste, knee joint.] boister·ous·ly adv. boister·ous·ness n. |
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