abstruseness
ab-struse-ness
noun
The quality of being difficult to understand; obscurity or reconditeness.
"The abstruseness of the theory baffled many."
Thesaurus
Synonyms: obscurity, reconditeness, obscureness, profundity, abstrusity, profoundness
Antonyms: clarity, clearness, limpidity, lucidity, lucidness, pellucidity