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foolproof

adjective

/ˈfuːlpruːf/

Meaning

Designed to be very easy to use or understand, leaving no possibility of failure or error.

The new software has a foolproof installation process.

reliable, certain, guaranteed, infallible, simple

complicated, fallible, unreliable

foolproof system, foolproof method, foolproof plan, foolproof solution

allowing light to pass through; clear and obvious; honest and open

in a state of complete confusion and disorder

using or involving physical force intended to hurt, damage, or kill; very forceful or powerful

firmly fixed; not likely to change or fail

very thin and bony, often looking unhealthy

difficult or impossible to digest; hard to process in the stomach