Bulletproof

Something is said to be bulletproof if it cannot be broken or is very tough. This concept usually applies to ideas; if a material is said to be bulletproof it usually means that literally it can withstand a direct shot by a bullet fired from a gun. So "a bulletproof window" is expected to protect someone behind it from gunfire, but a "bulletproof idea" is one that doesn't have any obvious flaws and is likely to succeed.

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