Try Our Apps


The Best Internet Slang


[fool-proof] /ˈfulˌpruf/
involving no risk or harm, even when tampered with.
a foolproof method.
Origin of foolproof
An Americanism dating back to 1900-05; fool1 + -proof Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
Cite This Source
Examples from the Web for foolproof
Contemporary Examples
Historical Examples
  • All of us—all the Academy top brass—develop a foolproof test for cadet maneuvers.

    Stand by for Mars! Carey Rockwell
  • He had to establish some sort of foolproof disguise, and he had to make contact with Earth's underground.

    The Status Civilization Robert Sheckley
  • There are a few sequences of words that really are foolproof, carrying their own atmosphere and dignity with them.

    The Book of Susan Lee Wilson Dodd
  • He had smashed the radio, a marvelously compact and foolproof outfit, arbitrarily tuned to a fixed short wave-length.

  • This time he wasn't afraid of meeting a Bandersnatch or anything else, for he had a method of escape that was foolproof.

    Insidekick Jesse Franklin Bone
British Dictionary definitions for foolproof


proof against failure; infallible: a foolproof idea
(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
Cite This Source
Word Origin and History for foolproof

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

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source

Word of the Day

Difficulty index for foolproof

Some English speakers likely know this word

Word Value for foolproof

Scrabble Words With Friends

Nearby words for foolproof