Noisy, energetic, and cheerfully rowdy; rough and stormy. Describes behavior that is lively and unrestrained, sometimes to an excessive degree.
From Middle English 'boistous' meaning 'rough, coarse,' possibly from Old French 'boisteus' (lame, limping). The meaning evolved from 'rough' to 'roughly playful' and then to 'energetically loud and cheerful.'
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