#1 bulletproof v. make bulletproof; "bulletproof the car". wn
#2 bulletproof s. [unassailable, unshakable, watertight] without flaws or loopholes; "an ironclad contract"; "a watertight alibi"; "a bulletproof argument". wn
#3 bulletproof s. not penetrable by bullets; "bulletproof glass"; "bulletproof vest". wn
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