/ ˈbɔɪstərəs; NAmE / adjective
( of people, animals or behaviour ) noisy and full of life and energy :
It was a challenge, keeping ten boisterous seven-year-olds amused.
► bois·ter·ous·ly adverb
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WORD ORIGIN
late Middle English (in the sense rough, stiff ): variant of earlier boistuous rustic, coarse, boisterous , of unknown origin.