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Definition of foolproof

foolproof

/ˈfuːl.pruːf/
fool · proof
Past Simple:foolproofed
•
Past Participle:foolproofed
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Present Participle:foolproofing
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foolproof Lexical Profile

foolproof Game Scores & Validity

• adjective

1

Incapable of going wrong or being misused; so simple, well-designed, or reliable as to be impervious to human error.

Example

"The chef shared a foolproof recipe for sourdough bread that even a complete beginner can master."

Synonyms
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Antonyms
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• verb

1

To design, modify, or configure (a system, device, or procedure) so that it cannot be misused or ruined by human error.

Example

"The software engineers worked all weekend to foolproof the registration portal before the public launch."

Synonyms
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• Nearby Words

foolish
foolishly
foolishness
foolproof
foosball
foot
footage

Word Origin & Etymology

Coined in American English in the early 20th century by combining 'fool' with the suffix '-proof' (originally meaning tested and proven resistant to), on the pattern of words like 'waterproof' and 'fireproof'.

Cite this Entry

Wordmom. (2026). Definition of Foolproof. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/foolproof
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