recondite

It's rather difficult to penetrate the meaning of recondite. Fitting, because it's an adjective that basically means hard for the average mind to understand.

If it's really hard to comprehend, then it's safe to say it's recondite. In the same family as "abstruse," "esoteric" and "totally deep, man," recondite is a very serious word that you could use to describe obscure philosophy books, high level mathematical theory, and the series finale of The Sopranos — you know, things that make your brain hurt.

Definitions of recondite
  1. adjective
    difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge
    “some recondite problem in historiography”
    synonyms: abstruse, deep
    esoteric
    confined to and understandable by only an enlightened inner circle
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