(a.) Alt. of Enigmatical.

able ambiguous amphibological amphibolous arcane baffling beguiling bewildering bothering cabalistic censored classified close closed concealed confounding confusing cryptic dark discomposing disconcerting dismaying distracting disturbing embarrassing equivocal equivocatory esoteric exceptional extraordinary fabulous fantastic fascinating hermetic hidden hush-hush incalculable incognizable incomprehensible inconceivable incredible intricate ironic latent marvelous miraculous multivocal mysterious mystifying obscure occult outlandish passing strange perplexing perturbing phenomenal polysemantic polysemous problematic prodigious puzzling rare remarkable restricted riddling sealed secret sensational smothered sphinxlike stifled strange striking stupendous suppressed top secret ulterior unapparent unapprehended unascertained unbeknown unbreatheable uncertain uncharted unclassified under security under wraps undisclosable undisclosed undiscoverable undiscovered undivulgable undivulged unexplained unexplored unexposed unfamiliar unfathomed unheard unheard-of unidentified unimaginable uninvestigated unique unknowable unknown unperceived unplumbed unprecedented unrevealable unrevealed unspoken unsuspected untellable untold untouched unutterable unuttered unwhisperable upsetting virgin wonderful wondrous