esoteric -
confined to and understandable by only an enlightened inner circle; "a compilation of esoteric philosophical theories"
exoteric suitable for the general public; "writings of an exoteric nature"
private concerning things deeply private and personal; "private correspondence"; "private family matters"
abstruse,
recondite,
deep 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"
arcane requiring secret or mysterious knowledge; "the arcane science of dowsing"
esoteric -
Understood only by a chosen few or an enlightened inner circle.
esoteric -
Having to do with concepts that are highly theoretical and without obvious practical application; often with mystical or religious connotations.
