bulletproof

from WordNet (r) 3.0 (2006)

bulletproof
    adj 1: without flaws or loopholes; "an ironclad contract"; "a
           watertight alibi"; "a bulletproof argument" [syn:
           {unassailable}, {unshakable}, {watertight},
           {bulletproof}]
    2: not penetrable by bullets; "bulletproof glass"; "bulletproof
       vest"
    v 1: make bulletproof; "bulletproof the car"

from The Collaborative International Dictionary of English v.0.48

bullet-proof \bul"let-proof`\, bulletproof \bul"let*proof`\, a.
   1. Capable of resisting the force of a bullet; resistant to
      penetration by a bullet; armored; as, a bulletproof vest;
      a bulletproof window.
      [1913 Webster +PJC]

   2. designed so as to be resistant to abuse or misuse and
      incapable of malfunction under normal use; as, a
      bulletproof computer program.
      [PJC]

   3. so well thought out as to be resistant to criticism or
      certain to succeed; as, a bulletproof plan.
      [PJC]

from Jargon File (4.4.4, 14 Aug 2003)

bulletproof
 adj.

   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}.

from The Free On-line Dictionary of Computing (8 July 2008)

bulletproof
armour-plated

   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.  Synonym {armor-plated}.

   [{Jargon File}]