enigmatic (adj.)
- able
- ambiguous
- arcane
- baffling
- beguiling
- cabalistic
- censored
- classified
- close
- closed
- concealed
- confounding
- confusing
- cryptic
- dark
- disconcerting
- dismaying
- disturbing
- embarrassing
- equivocal
- esoteric
- exceptional
- extraordinary
- fabulous
- fantastic
- fascinating
- hermetic
- hidden
- hush-hush
- incalculable
- incognizable
- incomprehensible
- inconceivable
- incredible
- intricate
- ironic
- latent
- marvelous
- miraculous
- mysterious
- mystifying
- obscure
- occult
- outlandish
- perplexing
- perturbing
- phenomenal
- polysemantic
- polysemous
- problematic
- prodigious
- puzzling
- rare
- remarkable
- restricted
- sealed
- secret
- sensational
- smothered
- stifled
- strange
- striking
- stupendous
- suppressed
- ulterior
- unapparent
- unbeknown
- uncertain
- uncharted
- unclassified
- undisclosed
- undiscoverable
- undiscovered
- unexplained
- unexplored
- unfamiliar
- unfathomed
- unheard
- unheard-of
- unidentified
- unimaginable
- unique
- unknowable
- unknown
- unperceived
- unplumbed
- unprecedented
- unrevealed
- unspoken
- unsuspected
- untellable
- untold
- untouched
- unutterable
- unuttered
- upsetting
- virgin
- wonderful
- wondrous
