The quality or degree of being full of disease; the state of being sick, infected, or unhealthy.
From diseaseful + -ness (noun suffix). Victorian medical writers stacked these suffixes to create abstract nouns for philosophical discussions about health and corruption.
The Victorians were obsessed with measuring everything, including abstract concepts—they would discuss the 'diseasefulness' of poor neighborhoods to argue scientifically for public health reforms, essentially quantifying suffering.
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