"bulletproof" in the verb sense
1. bulletproof
make bulletproof
"bulletproof the car"
"bulletproof" in the adjective sense
1. unassailable, unshakable, watertight, bulletproof
without flaws or loopholes
"an ironclad contract"
"a watertight alibi"
"a bulletproof argument"
2. bulletproof
not penetrable by bullets
"bulletproof glass"
"bulletproof vest"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License