recondite

US /ˈrek.ən.daɪt/
UK /ˈrek.ən.daɪt/
"recondite" picture
1.

dealing with very profound, difficult, or abstruse subject matter

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He was known for his recondite knowledge of ancient languages.
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The professor's lecture was full of recondite theories.
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abstruseesotericarcaneobscureprofound
2.

little known; obscure

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The book contained many recondite facts about medieval history.
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His research delved into recondite areas of quantum physics.
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obscureunfamiliarlittle-knownabstruseesoteric