/ Dictionary / Index I indefeasible: Meaning and Definition of Find definitions for: in•de•fea•si•ble Pronunciation: (in"di-fē'zu-bul), [key] — adj. not defeasible; not to be annulled or made void; not forfeitable. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: indefeasible (Thesaurus) indefatigable indefectible Related Content Daily Word Quiz: sequester Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language