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Abstruse
adjective – Difficult for one of ordinary knowledge or intelligence to understand.
Usage example: you're not the only one who finds Einstein's theory of relativity abstruse
Deep is a synonym for
abstruse in
characteristic topic. In some cases you can use "Deep" instead an
adjective "Abstruse", when it comes to topics like
difficult,
profound,
obscure,
easy.
popular alternative
Nearby Word:
abstrusity