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foolproof

[fool-proof] /ˈfulˌpruf/
adjective
1.
involving no risk or harm, even when tampered with.
2.
never-failing:
a foolproof method.
Origin
1900-1905
1900-05, Americanism; fool1 + -proof
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for foolproof
  • Though a prevalent ploy in nature, the fake-eye look isn't foolproof.
  • The only foolproof way to improve the public understanding of science across the board is through the educational system.
  • The backup and containment systems are hardly as robust and foolproof as the article makes them out to be.
  • These tools can be lifesavers, but, they aren't foolproof.
  • If all that math was foolproof, after all, no one would need test pilots.
  • Buyers can read reviews that others have written about each seller, which fosters trust, though it is far from foolproof.
  • For now, though, vigilance remains the only safeguard-albeit not a foolproof one.
  • It is not foolproof: not even the rich can buy off all hazards, and rich countries and individuals will make poor decisions.
  • Still, this is foolproof subject matter for a novelist of limited gifts.
  • But the process is not foolproof because markets can also be wrong.
British Dictionary definitions for foolproof

foolproof

/ˈfuːlˌpruːf/
adjective
1.
proof against failure; infallible: a foolproof idea
2.
(esp of machines) proof against human misuse, error, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for foolproof
adj.

also fool-proof, 1902, American English, "safe against the incompetence of a fool," from fool (n.) + proof.

Online Etymology Dictionary, © 2010 Douglas Harper
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17
19
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