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foolproof

 - 3 dictionary results

fool⋅proof

  [fool-proof]
Use foolproof in a Sentence
–adjective
1. involving no risk or harm, even when tampered with.
2. never-failing: a foolproof method.
Origin:
1900–05, Americanism; fool 1 + -proof
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To foolproof
fool·proof   (fōōl'prōōf')   
adj.  

  1. Designed so as to be impervious to human incompetence, error, or misuse: a foolproof detonator; a foolproof safety lock.

  2. Effective; infallible: a foolproof scheme.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

foolproof 
1902, Amer.Eng., "safe against the incompetence of a fool," from fool (n.) + proof (q.v.).
Online Etymology Dictionary, © 2001 Douglas Harper
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