| Adj. | 1. | bulletproof - without flaws or loopholes; "an ironclad contract"; "a watertight alibi"; "a bulletproof argument" |
| 2. | bulletproof - not penetrable by bullets; "bulletproof glass"; "bulletproof vest" |
| bulletproof - Used of an algorithm or implementation considered extremely robust; lossage-resistant; capable of correctly recovering from any imaginable exception condition - a rare and valued quality. Synonym armor-plated. |