foolproof[ fool-proof ]SEE DEFINITION OF foolproof
EXAMPLES FROM THE WEB FOR FOOLPROOF
All of us—all the Academy top brass—develop a foolproof test for cadet maneuvers.
He had to establish some sort of foolproof disguise, and he had to make contact with Earth's underground.
There are a few sequences of words that really are foolproof, carrying their own atmosphere and dignity with them.
He had smashed the radio, a marvelously compact and foolproof outfit, arbitrarily tuned to a fixed short wave-length.
This time he wasn't afraid of meeting a Bandersnatch or anything else, for he had a method of escape that was foolproof.
Someone would probably have to keep them wound from now on, unless they could devise a foolproof motor.
But trying to work out a foolproof plan would be a waste of time when she didn't know just what she was up against.
In other words, it tends more to make turrets and ordnance what the experts call "foolproof."
Fastest lens, foolproof operation, guaranteed for the life of the owner, and retailing for exactly twenty-five dollars.
He tried to figure out some foolproof way of cabling to Havana, but the censorship hazards were too great.