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esoteric
adjective /ˌɛs.əʊˈtɛɹ.ɪk,ˌɛs.əˈtɛɹ.ɪk,ˌɛs.oʊˈtɛɹ.ɪk/
a) Understood only by a chosen few or an enlightened inner circle.

The writing in this manual is very esoteric; I need a degree in engineering just to understand it!

b) Having to do with concepts that are highly theoretical and without obvious practical application.
Syn: arcane, recondite, cerebral, secretive
Ant: exoteric
See Also: esoterica, esoterically, esotericism, esotericist, esoterism

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