Cryptic

Adjective

 * 1) Having hidden meaning.
 * 2) Mystified or of an obscure nature.
 * 3) Involving use of code or cipher/cypher.

Noun

 * 1)  A cryptic crossword.

Thesaurus
abstruse, arcane, between the lines, cabalistic, cabbalistic, censored, classified, close, closed, concealed, covert, dark, delitescent, dormant, enigmatic, equivocal, esoteric, evasive, hermetic, hibernating, hidden, hush-hush, incomprehensible, inexplicable, inscrutable, latent, lurking, muffled, murky, mysterious, mystic, mystical, mystifying, nebulous, obfuscated, obscure, obscured, occult, opaque, perplexing, possible, potential, puzzling, recondite, restricted, riddling, secret, secretive, sleeping, smothered, sphinxlike, stifled, strange, submerged, suppressed, tenebrous, top secret, ulterior, unbreatheable, unclear, under security, under the surface, under wraps, underlying, undisclosable, undisclosed, undivulgable, undivulged, unfathomable, uninformative, unmanifested, unrevealable, unrevealed, unspoken, untellable, untold, unutterable, unuttered, unwhisperable, vague, veiled, virtual