bulletproof

/ˈbʊlɪtˌpruf/
adjective
  1. Designed to stop bullets from passing through; resistant to bullets.
    • The police officer wore a bulletproof vest during the dangerous mission.
    • They installed bulletproof doors in the bank for extra security.
    • The car's windows are made of bulletproof glass to protect the passengers.
  2. Very strong, safe, or certain to succeed; impossible to defeat or damage.
    • He has a bulletproof reputation after years of honest work.
    • The company thought its plan was bulletproof, but the market changed.
    • Her argument was bulletproof, so no one could find a flaw in it.
What does "bulletproof" mean? | whatsthatwordmean | whatsthatwordmean