Adjective bulletproof has 2 senses
  1. ironclad, unassailable, unshakable, watertight, bulletproof - without flaws or loopholes; "an ironclad contract"; "a watertight alibi"; "a bulletproof argument"
    Antonym: contestable (indirect, via incontestable)
  2. bulletproof - not penetrable by bullets; "bulletproof glass"; "bulletproof vest"
    Antonyms:
    unarmored, unarmoured (indirect, via armored)
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