/ Dictionary / Index B bulletproof: Meaning and Definition of Find definitions for: bul•let•proof Pronunciation: (bool'it-prf"), [key] — adj. (of vehicles, glass, clothing, etc.) capable of resisting or absorbing the impact of a bullet. safe from failure; without errors or shortcomings and beyond criticism: a bulletproof system; a bulletproof budget. —v.t. to make (something) bulletproof. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: bulletproof (Thesaurus) bulletin board bullet train Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language