adj
foolproof
FOOL-proof
adj
1
Designed so simply or solidly that it can't go wrong, even if misused.
"She swore by her foolproof recipe for chocolate cake."
"The new lock is meant to be foolproof against tampering."
How to Use Foolproof
Learner’s notesIn plain EnglishSo reliable or simple that it's very hard to get wrong.
Common pairings
a foolproof plan
foolproof method
Word Forms
more foolproof comparative, foolproofed past tense, foolproofs singular, most foolproof superlative
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Etymology
Built from fool + proof, meaning "proof against fools," i.e. safe even from careless use.