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6 days ago · The meaning of FOOLPROOF is so simple, plain, or reliable as to leave no opportunity for error, misuse, or failure. How to use foolproof in a sentence.

FOOLPROOF definition: 1. (of a plan or machine) so simple and easy to understand that it is unable to go wrong or be used…. Learn more.

Definition of foolproof adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

1. involving no risk or harm, even when tampered with. 2. never-failing: a foolproof method.

Something such as a plan or a machine that is foolproof is so well designed, easy to understand, or easy to use that it cannot go wrong or be used wrongly. The system is not 100 per cent foolproof. I spent …

May 9, 2026 · Adjective foolproof (comparative more foolproof, superlative most foolproof) Of a device: protected against, or designed to be proof against, misuse or error. Of an idea or plan: certain to …

FOOLPROOF definition: involving no risk or harm, even when tampered with. See examples of foolproof used in a sentence.

foolproof, adj. meanings, etymology, pronunciation and more in the Oxford English Dictionary

The adjective foolproof means infallible or, more literally, impervious to the incompetence of fools. Just as a bulletproof vest makes one invulnerable to bullets, a foolproof plan is designed to be …