bulletproof
US /ˈbʊl.ɪt.pruːf/
UK /ˈbʊl.ɪt.pruːf/
1.
made of a material that can stop bullets
:
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The president's car is completely bulletproof.
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They installed bulletproof glass in the bank.
2.
impossible to criticize, defeat, or damage
:
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His argument was completely bulletproof.
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The company's financial plan is bulletproof against market fluctuations.