The quality or state of being abstruse; something that is difficult to understand or comprehend.
From abstruse + -ity suffix (from Latin -itas). This is a Latinized alternative to abstruseness, formed using the Romance language suffix pattern common in formal English.
English borrowed two different ways to say the same thing from Latin: 'abstruseness' (using English's -ness suffix) and 'abstrusity' (using the -ity suffix imported directly from Latin). Over time, 'abstruseness' became more common, leaving 'abstrusity' as an archaic variant.
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