Synonyms for bulletproof

Adjective

1. ironclad, unassailable, unshakable, watertight, bulletproof, incontestable (vs. contestable), incontestible

usage: without flaws or loopholes; "an ironclad contract"; "a watertight alibi"; "a bulletproof argument"

2. bulletproof, armored (vs. unarmored), armoured

usage: not penetrable by bullets; "bulletproof glass"; "bulletproof vest"