definition of
bulletproof

[1] #1 bulletproof v. make bulletproof; "bulletproof the car". wn

[2] #2 bulletproof s. [unassailable, unshakable, watertight] without flaws or loopholes; "an ironclad contract"; "a watertight alibi"; "a bulletproof argument". wn

[3] #3 bulletproof s. not penetrable by bullets; "bulletproof glass"; "bulletproof vest". wn