bulletproof

Everyday

1. Strong enough to stop bullets from going through, like a bulletproof vest or glass. tree →
2. (informal) Not able to fail or be harmed; very safe or certain. tree →

In the lessons

In news and stories it appears with police, soldiers and important people. In everyday talk it means very strong or reliable ("a bulletproof plan"). Phrases: "bulletproof vest", "bulletproof glass", "bulletproof car".

Examples

• Police officers wear bulletproof vests. tree →
• The president's car has bulletproof glass. tree →
• The bank counter is protected by bulletproof screens. tree →
• His excuse wasn't bulletproof, and the teacher saw through it. tree →
• Nobody is bulletproof, so ride your bike carefully. tree →

Note

One word. "-proof" means protected against, like waterproof and soundproof. Many "bulletproof" vests are really bullet-resistant and cannot stop every bullet.