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WordNet-Online
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Adjective abstruse has 1 sense
- abstruse, deep, recondite - difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge; "the professor's lectures were so abstruse that students tended to avoid them"; "a deep metaphysical theory"; "some recondite problem in historiography"
Antonym: exoteric (indirect, via esoteric)
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