/ Dictionary / Index I irrebuttable: Meaning and Definition of Find definitions for: ir•re•but•ta•ble Pronunciation: (ir"i-but'u-bul), [key] — adj. not rebuttable; incapable of being rebutted or refuted. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. irreal irreclaimable Related Content Daily Word Quiz: stringent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language