English

Noun

abstrusity ‎(plural abstrusities)

1. (archaic) Abstruseness; that which is abstruse. [First attested in the mid 17^th century.]^[1]

References

1. ↑ Lesley Brown (editor), The Shorter Oxford English Dictionary, 5th edition (Oxford University Press, 2003 [1933], ISBN 978-0-19-860575-7), page 10