Word
foolproof
Phoneticsfool·proof, stress on the first syllable
US/ˈfuɫˌpɹuf/
UK/fˈuːlpɹuːf/
Definition
v. describing a plan or method that is very difficult to fail. You use this when you want to say something is safe and reliable.
v. describing a plan, method, or system that is highly unlikely to fail or be defeated. Often used to describe security measures or simple instructions that are hard to mess up.
Examples
“The new security system is foolproof.”
“The recipe is foolproof, so even if you are a beginner, you will get great results.”
“The architect designed the building with a foolproof drainage system to prevent any water damage during the heavy seasonal rains.”
Examples
simple
“The new security system is foolproof.”
contextual
“The recipe is foolproof, so even if you are a beginner, you will get great results.”
complex
“The architect designed the building with a foolproof drainage system to prevent any water damage during the heavy seasonal rains.”
Real-World Examples
“When Céline Dion’s era as a foolproof hitmaker ended, she seemed weirdly liberated and more willing to take risks.” “Keep in mind that screen-time limits aren't foolproof.” Etymology
From fool + -proof.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.
- Exam level
- CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.B2 FirstIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.5.5–6.5TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 4.0–4.572–94TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.785–944
- Frequency
- Occasional
- Level
- B2 · Upper Intermediate
- Updated
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QR code
englishreference.com/q/foolproof