foolproof.
Of a device: protected against, or designed to be proof against, misuse or error.
Meaning & usage
Of a device: protected against, or designed to be proof against, misuse or error.
Of an idea or plan: certain to succeed in all eventualities, or claimed to be so; infallible.
Where this word comes from
Etymology tree Proto-Indo-European *bʰelǵʰ-der. Latin follis Old French folbor. Middle English fol English fool English proof English -proof English foolproof From fool + -proof.
To render (something) foolproof.
We foolproofed the operations.
Where this word comes from
Etymology tree Proto-Indo-European *bʰelǵʰ-der. Latin follis Old French folbor. Middle English fol English fool English proof English -proof English foolproof From fool + -proof.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.