In a loud, energetic, and noisy manner; with wild enthusiasm or rough playfulness.
From 'boisterous' (meaning loud and rowdy) plus the adverbial suffix '-ly,' where 'boisterous' itself came from Middle English, possibly influenced by Dutch or Germanic roots suggesting roughness and loudness.
Linguists still debate the true origin of 'boisterous'—some think it might come from Old Norse words for 'bushy' or 'rough,' which perfectly captures how the word evolved to describe thick, wild, untamed noise, like a bushy forest of sound.
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