Simple past tense and past participle of proof.(verb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "proofed" in a sentence
"They went on the grid with “a piece of canvas underneath and over the top, a tailored cover in proofed canvas, leather-bound.”"
"I have also received the galleys to be proofed, which is a first for me (and justifies hauling out the userpic which I made a little while ago for matociquala)."
"While their governments seems to think that by joining the EMU they will be "shock-proofed," they should just get rid of the "proofed" part and realize that they will shock their citizens into a new kind of indentured servitude."