Breadcrumb Home > Dictionary > Index I insurmountable: Meaning and Definition of Find definitions for: in•sur•mount•a•ble Pronunciation: (in"sur-moun'tu-bul), [key] — adj. incapable of being surmounted, passed over, or overcome; insuperable: an insurmountable obstacle. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: insurmountable (Thesaurus) insuring clause insurrection ✖ Related Content Daily Word Quiz: sophism Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language