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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

having complete or unlimited knowledge and awareness

Extremely small in size or amount; so tiny as to be almost negligible.

Excessively concerned with clothes and appearance in a vain or foolish way.

having a dashing, jaunty, or slightly disreputable quality or appearance

humble in status, position, or manner

relating to a statement that declares something; in grammar, a sentence that makes a statement