/ Dictionary / Index U unspeakable: Meaning and Definition of Find definitions for: un•speak•a•ble Pronunciation: (un-spē'ku-bul), [key] — adj. not speakable; that may not be spoken. exceeding the power of speech; unutterable; inexpressible; indescribable. inexpressibly bad or objectionable. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: unspeakable (Thesaurus) unspeak unspent Related Content Daily Word Quiz: inutiae Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language