Plural of abstrusity; multiple instances of things that are abstruse, difficult to understand, or obscure.
From abstrusity + -ies plural suffix. The word abstrusity itself comes from abstruse + -ity suffix (Latin -itas). This follows the pattern of abstract noun formation from Latin-based adjectives.
Like 'abstruseness,' this word reflects how English allows multiple ways to express the same idea—you can say 'abstrusenesses,' 'abstrusities,' or 'obscurities.' Different centuries preferred different forms, showing how language evolves.
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