concise
cryptical
esoteric
incomprehensible
inexplicable
abstruse
arcane
between the lines
cabalistic
cabbalistic
censored
classified
close
closed
concealed
covert
dark
delitescent
dormant
enciphered
encoded
encrypted
enigmatic
equivocal
evasive
hermetic
hibernating
hidden
hush-hush
inscrutable
latent
lurking
muffled
murky
mysterious
mystic
mystical
mystifying
nebulous
obfuscated
obscure
obscured
occult
opaque
perplexing
possible
ambiguous
baffle
complimentary
confuse
curt
emphatic
enigmatical
explanatory
fragmentary
laconic
meaningless
mislead
noncommittal
ominous
oracular
peremptory
pithy
unintelligible
vague
apocalyptic
ecliptic
triptych