unutterable (adj.)
- arcane
- awesome
- awful
- cabalistic
- censored
- classified
- close
- closed
- concealed
- cryptic
- dark
- divine
- enigmatic
- esoteric
- heavenly
- hermetic
- hidden
- holy
- hush-hush
- inconceivable
- incredible
- indefinable
- indescribable
- ineffable
- inexpressible
- inviolable
- inviolate
- latent
- marvelous
- mysterious
- noncommunicable
- numinous
- occult
- prodigious
- religious
- restricted
- sacred
- sacrosanct
- secret
- smothered
- spiritual
- stifled
- suppressed
- ulterior
- unbelievable
- undefinable
- undisclosed
- unimaginable
- unmentionable
- unnameable
- unrevealed
- unspeakable
- unspoken
- untellable
- untold
- untouchable
- unuttered
- venerable
- wonderful
- wondrous
Sigh'd and look'd unutterable things.
