bullet-proof
bul´let-proof`
| a. | 1. | Capable of resisting the force of a bullet; resistant to penetration by a bullet; armored; as, a bulletproof vest; a bulletproof window. |
| 2. | designed so as to be resistant to abuse or misuse and incapable of malfunction under normal use; as, a bulletproof computer program. | |
| 3. | so well thought out as to be resistant to criticism or certain to succeed; as, a bulletproof plan. |