/ Dictionary / Index I impassable: Meaning and Definition of Find definitions for: im•pass•a•ble Pronunciation: (im-pas'u-bul, -pä'su-), [key] — adj. not passable; not allowing passage over, through, along, etc.: Heavy snow made the roads impassable. unable to be surmounted: an impassable obstacle to further negotiations. (of currency) unable to be circulated: He tore the bill in half, making it impassable. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: impassable (Thesaurus) impartible impasse Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language