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adj. abstruse, esoteric

adj. oral; intended for listeners; applied to the esoteric teachings of Aristotle, those intended for his genuine disciples, in distinction from his exoteric or public doctrines

adj. Communicated orally; oral; -- applied to the esoteric teachings of Aristotle, those intended for his genuine disciples, in distinction from his exoteric doctrines, which were adapted to outsiders or the public generally. Hence: Abstruse; profound.

Abstruse; pertaining to deep learning: opposed to exoteric.

"The former -- discursive proofs -- ought to be termed acroamatic proofs, rather than demonstrations, as only words are employed in them, while demonstrations proper, as the term itself indicates, always require a reference to the intuition of the object."

acroamatical   

method   

acroamatics   

oral    profound