The Open Dictionary

bulletproof

adjective

UK/ˈbʊl.ɪt.pruːf/
US/ˈbʊl.ɪt.pruːf/

Definitions of bulletproof adjective

  1. Designed to resist penetration by bullets.

    • The limousine features bulletproof windows.

    • The president always wears a bulletproof vest for safety.

    • The bank tellers are protected by bulletproof glass.