/ Dictionary / Index I illegible: Meaning and Definition of Find definitions for: il•leg•i•ble Pronunciation: (i-lej'u-bul), [key] — adj. not legible; impossible or hard to read or decipher because of poor handwriting, faded print, etc.: This letter is completely illegible. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: illegible (Thesaurus) illegal procedure illegit 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