esoteric

1. Confined to and understandable by only an enlightened inner circle (synset 300902256)
   "a compilation of esoteric philosophical theories"
   also: private - confined to particular persons or groups or providing privacy
   similar to:

   • abstruse, deep, recondite - difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge
   • arcane - requiring secret or mysterious knowledge
   • cabalistic, cryptic, cryptical, kabbalistic, qabalistic, sibylline - having a secret or hidden meaning
   • mysterious, mystic, mystical, occult, orphic, secret - having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding

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