foolprooffool‧proof /ˈfuːlpruːf/ ●○○ adjective 
Examples
a foolproof way of preventing credit card fraud
ExamplesEXAMPLES FROM OTHER DICTIONARIES
Thesaurus- A pasta book is a foolproof gift for anyone who cooks.
- Condoms aren't a foolproof method of preventing pregnancy.
- Each article goes through a foolproof system of checking which ensures that there are no mistakes in the final text.
- I thought this method was foolproof until four customer orders went missing.
- The gang hit on a seemingly foolproof way of getting drugs into the country.
- The new speech recognition system is not absolutely foolproof, but it is a huge breakthrough.
- There's no foolproof way to judge whether someone is the right person for the job.
- Even so, marriage is hardly a foolproof enforcer of monogamy.
- First, no technology is foolproof, especially electronic technology; we still need very old-fashioned backup systems.
- It's foolproof, watertight, totally convincing.
- The foolproof fuel system has interconnected front and rear fuselage flexible tanks holding 255 and 475 litres.
- The key, here, was not kept under a flowerpot or stone but in a more foolproof and elaborate hiding-place.
- These tips are intended to help, but should not be regarded as foolproof.
Longman Language Activatorcertain to win or succeed► be destined to
a foolproof method, plan, system etc is certain to be successful SYN infallible: if someone is destined to do or become something, they will certainly do it or become it, especially something that will make them famous or admired: · She was convinced that her little boy was destined to become President.· Clara worked in a factory and sang in clubs at weekends - but even then you could tell that she was destined to become a star.
► be assured of formal to be certain to get something good or to be successful: · After the success of its recent single, the band is now assured of a contract with a major record company.· Our clients are assured of comfortable accommodation and the attention of our trained staff.
► somebody/something is a dead cert spoken informal use this to say that someone or something will definitely win or succeed: · I'm betting on Sceptre. He's a dead cert to win the Gold Cup.
► can't go wrong spoken use this to say that something or someone will definitely be successful: · We've been through the plan a dozen times. It can't go wrong.· Just follow the instructions and you can't go wrong.
► it's in the bag spoken informal use this to say that you will certainly get something you want, or something you want will certainly happen, because you have almost got it or it has almost happened already: · You're bound to get Bill's job when he leaves - it's in the bag.be in the bag: · If we win the next game, the championship's in the bag.
► it's a safe bet/it's a sure bet/it's a sure thing use this to say that it is almost certain something will happen because of what you know of the situation: · I told my friends it was a sure thing, and they bet every last penny on that horse of yours.it's a safe bet/it's a sure bet/it's a sure thing (that): · If the President supports him it's a sure bet that he'll get a seat in Congress.· As it was the first concert of the season it was a safe bet all the critics would be there.
► foolproof a foolproof plan or method is one that is certain to work and be successful: · A pasta book is a foolproof gift for anyone who cooks.foolproof method/system/plan etc: · The new speech recognition system is not absolutely foolproof, but it is a huge breakthrough.· The gang hit on a seemingly foolproof way of getting drugs into the country.
always effective► reliable · The system is new, but so far it seems to be reliable.a reliable way/method etc of doing something · Eating sensibly and taking regular exercise is a fairly reliable method of losing weight.· In Africa, cellular phones are often the only reliable way of communicating.
► surefire certain to be effective or successful: · Thursday night's line-up includes such surefire attractions as 'The Simpsons' and 'Friends'.a surefire way to do something/of doing something: · I know a surefire way to get a car started on a freezing winter morning.a surefire solution to something: · There's no surefire solution to the problem of improving the company's performance.a surefire recipe for success/disaster (=something that is certain to be successful or not successful): · Going on holiday with my parents would be a surefire recipe for disaster.
► foolproof a method, system, or plan that is foolproof is always effective, because it is simple to understand and operate, and cannot go wrong: · I thought this method was foolproof until four customer orders went missing.· Each article goes through a foolproof system of checking which ensures that there are no mistakes in the final text.a foolproof way to do something/of doing something: · There's no foolproof way to judge whether someone is the right person for the job.
► infallible a method or system that is infallible always produces the right result and never goes wrong: · Banks claim their cash-dispensing computers are infallible.an infallible way to do something/of doing something: · There is no infallible way of predicting exactly what the weather will be like.
► never fails/can't fail/works every time spoken use this to tell someone that a method is always effective, especially when you have used it successfully before: · It's a very simple technique, but it never fails.· If I'm having trouble sleeping, having a hot bath at night works every time.· You should try this recipe. It's so easy that you can't fail.
a foolproof way of preventing credit card fraud