Foolproof meaning

fo͝ol'pro͝of'
The definition of foolproof is something that is designed or set up so it would be difficult or impossible to make a mistake or an error during use.

When an appliance is designed with very-simple to use buttons that even a really dumb person can use, this is an example of a time when the appliance is designed to be foolproof.

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Designed so as to be impervious to human incompetence, error, or misuse.

A foolproof detonator; a foolproof safety lock.

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Effective; infallible.

A foolproof scheme.

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So simple, well-designed, or sturdily made as not to be mishandled, damaged, misunderstood, etc. even by a fool.
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For a device: protected, or designed to be proof against misuse or error; fail-safe.
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For an idea or plan: infallible, or bulletproof.
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Origin of foolproof

  • fool +‎ -proof
    From Wiktionary