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foolproof

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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.

(adjective)

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.

See foolproof in Webster's New World College Dictionary

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adjective

so simple, well-designed, or sturdily made as not to be mishandled, damaged, misunderstood, etc. even by a fool

See foolproof in American Heritage Dictionary 4

adjective

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

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