- involving no risk or harm, even when tampered with.
- never-failing: a foolproof method.
Origin of foolproof
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for foolproof
A “foolproof” way to make the diagnosis would be news indeed!How to Tell When a Scientific Study Is Total B.S.
August 22, 2014
Cry No More Every parent tires of hearing their child cry, but not everyone finds such a foolproof way to make it stop.North West Debuts, Rob Ford Arm-Wrestles Hulk Hogan & More Viral Videos
The Daily Beast Video
August 24, 2013
Of all the potential holiday gifts, few are as foolproof as cash or gift cards.What to Do With Unwanted Gift Cards
December 26, 2012
Dan Gross on why the episode is a reminder that the vaunted cloud is much like the Web in the 1990s—young and far from foolproof.Blame It on the Cloud: Amazon Outage Shows Peril of Outsourcing Data
October 25, 2012
The only foolproof way to avoid pregnancy is, of course, not to have sex.Gail Collins on Texas’s Abstinence Sex Education Problems
June 4, 2012
All of us—all the Academy top brass—develop a foolproof test for cadet maneuvers.Stand by for Mars!
He had to establish some sort of foolproof disguise, and he had to make contact with Earth's underground.The Status Civilization
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
- proof against failure; infalliblea 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
Word Origin and History for foolproof
Online Etymology Dictionary, © 2010 Douglas Harper