bul·let·proof 
(blĭt-prf′)
(blĭt-prf′)adj.
1. Impenetrable by bullets.
2. Informal Impervious to assault, damage, or failure; guaranteed: a bulletproof method; bulletproof arguments.
tr.v. bul·let·proofed, bul·let·proof·ing, bul·let·proofs
To make impenetrable by bullets.
- presentiment
- presentimental
- presently
- presentment
- presentness
- present participle
- present perfect
- present tense
- preservability
- preservable
- preservation
- preservationism
- preservationist
- preservative
- preserve
- preserver
- preset
- presettable
- preshrunk
- pre-shrunk
- preside
- presidency
- president
- president-elect
- presidential