The quality or state of being dull; lack of sharpness, brightness, or interest.
From 'dull' + '-ity' (suffix forming nouns of quality or condition). The '-ity' suffix comes from Latin and creates abstract nouns describing states or qualities.
While 'dullness' is the common word, 'dullity' is the fancy philosophical version—some languages like Italian and French naturally prefer this '-ity' form, showing how English has multiple ways to describe the same thing.
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