Un‐ut″ter‐a‐ble (?), a. Not utterable; incapable of being spoken or voiced; inexpressible; ineffable; unspeakable; as, unutterable anguish.
Sighed and looked unutterable things. Thomson.
— Un‐ut″ter‐a‐ble‐ness, n. — Un‐ut″ter‐a‐bly, adv.
Webster's Dictionary 1913
Un‐ut″ter‐a‐ble (?), a. Not utterable; incapable of being spoken or voiced; inexpressible; ineffable; unspeakable; as, unutterable anguish.
Sighed and looked unutterable things. Thomson.
— Un‐ut″ter‐a‐ble‐ness, n. — Un‐ut″ter‐a‐bly, adv.