Loud, energetic, and somewhat rowdy or rough in manner; full of noisy enthusiasm or wild behavior.
Middle English 'boistous' from Old French 'boisteus,' possibly from Latin 'bestia' (beast). The word originally meant rough or violent, gradually evolving to mean loud and energetic in a playful way.
The word 'boisterous' sounds loud and bouncy itself—a perfect example of onomatopoeia in form! Linguists call this 'phonaesthesia,' where the sound of a word echoes its meaning, making 'boisterous' feel like what it describes.
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