The Collaborative International Dictionary of English v.0.48:

goofproof \goof"proof`\ v. t.
   To design (a device or plan of action) so that it will
   function properly even if treated badly or executed ineptly;
   foolproof.

   Syn: foolproof.
        [WordNet 1.5 +PJC]

The Collaborative International Dictionary of English v.0.48:

goofproof \goof"proof`\ a.
   such as will function properly even if treated badly or
   ineptly; foolproof; -- of devices, plans, recipes, etc.; as,
   nothing running under Windows is completely goofproof.

   Syn: foolproof.
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

goof-proof
    v 1: proof against human misuse or error; "foolproof this
         appliance" [syn: goofproof, goof-proof, foolproof]