Plural of dismality; multiple instances or aspects of gloominess, dreariness, or depression.
From dismality (dismal + -ity, a suffix forming abstract nouns) + -ies (plural). The abstract noun form is rare, forming plural to describe multiple gloomy states or situations.
This is a word that feels deliberately archaic and literary—it's the kind of word a Gothic novelist would use to describe the 'dismalities of the haunted mansion,' but you'd never hear it in everyday speech.
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