A Plan That Surely Cannot Fail
This page is the CodyCross answer for the clue below from Renaissance, Group 1390, Puzzle 2 (San Giorgio Monastery).
Question is: A Plan That Surely Cannot Fail
and the answer is: FOOLPROOF
Word Meaning:
FOOLPROOF — Of a device: protected against, or designed to be proof against, misuse or error.
Definitions from Wiktionary.