The quality or state of being loud, rowdy, energetic, and unrestrained in behavior or sound.
From 'boisterous' plus the suffix '-ness' (indicating a state or quality), tracing back through Middle English to uncertain Germanic or Norse origins suggesting wild, rough, or bushlike qualities.
Victorian parents were genuinely concerned about 'boisterousness' in children—etiquette books warned that loud, energetic play was a sign of poor breeding, making this abstract noun a window into how much our attitudes toward childhood exuberance have changed.
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