/ Dictionary / Index I insupportable: Meaning and Definition of Find definitions for: in•sup•port•a•ble Pronunciation: (in"su-pôr'tu-bul, -pōr'-), [key] — adj. not endurable; unbearable; insufferable: insupportable pain. incapable of support or justification, as by evidence or collected facts: an insupportable accusation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: insupportable (Thesaurus) insuperable insuppressible Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language