/ Dictionary / Index U unreliable: Meaning and Definition of Find definitions for: un•re•li•a•ble Pronunciation: (un"ri-lī'u-bul), [key] — adj. not reliable; not to be relied or depended on. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: unreliable (Thesaurus) unrelenting unreligious Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language