1. (

• bulletproof

) make bulletproof; "bulletproof the car" ;

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" ;