foolproof

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foolproof

/ˈfuːl ˌpɹuːf/

adjective more foolproof · most foolproof

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. Dill had hit upon a foolproof plan to make Boo Radley come out at no cost to ourselves (place a trail of lemon drops from the back door to the front yard and he’d follow it, like an ant).

verb foolproofs · foolproofing · foolproofed

transitive To render (something) foolproof. We foolproofed the operations.

Translations

Every language

adj (device) fail-safe

Español	seguro, a prueba de tontos
中文	防呆 fángdāi
Deutsch	narrensicher, idiotensicher

adj (plan) infallible

Español	infalible
Français	infaillible
العربية	مُحْكَمَة muḥkama

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MLA

"foolproof." Wiktionary, via Micwyn, micwyn.com/word/foolproof. Accessed 6 Nov. 2026.

APA

foolproof. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/foolproof

Chicago

"foolproof." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/foolproof.

BibTeX

@misc{foolproof_2026,
  title = {foolproof},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/foolproof},
  urldate = {2026-11-06}
}