Answer:

arcane

Answer	Crossword Clue
ARCANE	Esoteric
ARCANE	Mysterious
ARCANE	Understood by only a few

ARCANE	Like knowledge that should be kept to a minimum in crossword clues
ARCANE	Known to just a few
ARCANE	Understood by a rare few
ARCANE	Like trade secrets
ARCANE	Secret
ARCANE	Obscure
ARCANE	Like secret rituals
ARCANE	Not widely understood

ARCANE	Understood by very few
ARCANE	Mysterious for most
ARCANE	Known only by insiders
ARCANE	Myterious
ARCANE	Difficult to understand
ARCANE	Secret, as rituals
ARCANE	Hard to fathom
ARCANE	Known by few

ARCANE	Not generally known
ARCANE	Cryptic
ARCANE	Hard to understand
ARCANE	Not commonly known
ARCANE	Tough to understand
ARCANE	Hidden.
ARCANE	Hidden; secret.
ARCANE	Secret.

ARCANE	Esoteric or secret.
ARCANE	Mysterious.
ARCANE	Hidden
ARCANE	Recondite
ARCANE	+Secret
ARCANE	Like Federal tax laws
ARCANE	Abstruse
ARCANE	Cabalistic

ARCANE	Like federal tax laws?
ARCANE	Like cult rituals
ARCANE	Like federal tax laws
ARCANE	Like election laws, typically
ARCANE	Impenetrable