foolproof in the PONS Dictionary

Monolingual examples (not verified by PONS Editors)

English
However, researchers found one cookiecutter shark in the stomach of a large bluefin tuna, suggesting the tactic isn't foolproof.
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The railways were so heavily promoted as a foolproof venture that thousands of investors on modest incomes bought large numbers of shares whilst only being able to afford the deposit.
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Oxygen concentrators are considered sufficiently foolproof to be supplied to individual patients as a prescription item for use in their homes.
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While the dead drop method is useful in preventing the instantaneous capture of either an operative/handler pair or an entire espionage network, it is not foolproof.
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It's a foolproof plan because these despicable individuals have nothing to lose and their failure on the battleground (read death) means good riddance.
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Traditional security measures are not always foolproof.
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However, CBI also noted that the guards were mobile during the night, and their statements can not be considered foolproof.
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Not every time is it foolproof though, and at one crime scene, a witness spots the main culprit.
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Obviously not foolproof, the conning officer of the vessel having made the course change, must continually monitor bearing lest the other vessel does the same.
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They are usually foolproof, allowing for wide coverage and range of applications.
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