bulletproof
bul-let-proof
adjective
Impervious to criticism, failure, or attack; extremely robust and resilient.
"Her alibi was completely bulletproof."
adjective
Designed to resist penetration by bullets, offering protection against firearms.
"The car had bulletproof windows for security."
Thesaurus
Synonyms: armored, armoured, ironclad, incontestable, unshakable, unassailable, watertight, incontestible