UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈbʊlɪtpruːf/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˈbʊlɪtˌpruf/ ,USA pronunciation: respelling(bŏŏlit pro̅o̅f′)

WordReference Random House Learner's Dictionary of American English © 2020
bul•let•proof /ˈbʊlɪtˌpruf/USA pronunciation   adj. 
  1. (of vehicles, clothing, etc.) capable of absorbing or reducing the impact of a bullet:a bulletproof vest.

WordReference Random House Unabridged Dictionary of American English © 2020
bul•let•proof  (bŏŏlit pro̅o̅f′),USA pronunciation adj. 
  1. (of vehicles, glass, clothing, etc.) capable of resisting or absorbing the impact of a bullet.
  2. [Informal.]safe from failure;
    without errors or shortcomings and beyond criticism:a bulletproof system; a bulletproof budget.

  1. to make (something) bulletproof.
  • bullet + -proof 1855–60

Collins Concise English Dictionary © HarperCollins Publishers::
bulletproof /ˈbʊlɪtˌpruːf/ adj
  1. not penetrable by bullets
  1. (transitive) to make bulletproof
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