- Esoteric
- Hard to understand
- Mysterious
- Secret
- Secret or mysterious
- Secret, mysterious
- Hidden; secret.
- Difficult to understand
- Esoteric
- Stubs are complicated and hard to understand
- Concealed or hidden out of the way.
- Remote from apprehension; difficult to be comprehended or
understood; recondite; as, abstruse learning.
- ... or outer
- Church’s ... sanctum
- Esoteric
- Hidden
- Hidden (feelings)
- Hidden within
- Inside
- Esoteric; lofty
- Less dense than normal
- of Rarefy