ineffable /ɪˈnɛf.ə.bəl/adjective 2noun 1forms 1 adjective2 •Beyond expression in words; unspeakable.Devotion bids aspire to nobler things, to boundless love, and joys ineffable: and such her expectation from kind Heav'n. — 1750 •Forbidden to be uttered; taboo. noun1 •Something that is beyond utterance; something unspeakable. formsineffables