The quality or state of being boisterous; loud, energetic, and rowdy behavior or atmosphere.
From 'boisterous' plus the nominal suffix '-ness,' which comes from Old English and Germanic roots. The '-ness' suffix (appearing in words like 'happiness' and 'darkness') converts adjectives into abstract nouns describing their essential qualities.
English has an astonishing ability to turn any adjective into an abstract noun with '-ness'—we can theoretically create endless words describing intangible qualities. This flexibility made English perfect for scientific and philosophical writing!
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