CRYPTICAL
cabalistic, kabbalistic, qabalistic, cryptic, cryptical, sibylline
(adjective) having a secret or hidden meaning; “cabalistic symbols engraved in stone”; “cryptic writings”; “thoroughly sibylline in most of his pronouncements”- John Gunther
cryptic, cryptical, deep, inscrutable, mysterious, mystifying
(adjective) of an obscure nature; “the new insurance policy is written without cryptic or mysterious terms”; “a deep dark secret”; “the inscrutable workings of Providence”; “in its mysterious past it encompasses all the dim origins of life”- Rachel Carson; “rituals totally mystifying to visitors from other lands”
Source: WordNet® 3.1
Adjective
cryptical (comparative more cryptical, superlative most cryptical)
cryptic
Source: Wiktionary
Cryp"tic (krp"tk), Cryp"tic*al (-t-kal), a. Etym: [L. crypticus, Gr.
Definition: Hidden; secret; occult. "Her [nature's] more cryptic ways of
working." Glanvill.
Source: Webster’s Unabridged Dictionary 1913 Edition