Princeton's WordNet

1. unassailable, unshakable, watertight, bulletproof(adj)

   without flaws or loopholes

   "an ironclad contract"; "a watertight alibi"; "a bulletproof argument"

2. bulletproof(verb)

   not penetrable by bullets

   "bulletproof glass"; "bulletproof vest"

3. bulletproof(verb)

   make bulletproof

   "bulletproof the car"

Wiktionary

1. bulletproof(Verb)

   To make proof against bullets.

2. bulletproof(Verb)

   to make resistant to failure.

   We have to bulletproof this program before we let the users at it; check every input, catch every possible flaw...it must not fail in use.

3. bulletproof(Adjective)

   Capable of withstanding a direct shot by a bullet fired from a gun.

4. bulletproof(Adjective)

   reliable, infallible, sturdy or error-tolerant.

5. bulletproof(Adjective)

   Unbreakable, very tough.

The New Hacker's Dictionary

1. bulletproof

   Used of an algorithm or implementation considered extremely robust; lossage-resistant; capable of correctly recovering from any imaginable exception condition — a rare and valued quality. Implies that the programmer has thought of all possible errors, and added code to protect against each one. Thus, in some cases, this can imply code that is too heavyweight, due to excessive paranoia on the part of the programmer. Syn. armor-plated.

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