Definition of foolproof in US English:



  • Incapable of going wrong or being misused.

    ‘a foolproof security system’
    • ‘True, democracy and the rule of law provide no foolproof security guarantee.’
    • ‘Now, no one wants the president assassinated, but the reality is no security is foolproof.’
    • ‘They are supposed to be foolproof and guaranteed to keep horses and jockeys safe, and to open in unison.’
    • ‘While you could just write random addresses in Amsterdam we have a foolproof system in place.’
    • ‘The foolproof system gives little room for manipulation by the conductor.’
    • ‘Letters coming to MEPs in Brussels are scanned, but the system is not foolproof.’
    • ‘Since the Christmas holidays, my foolproof, and copyrighted, two-stage sleeping system has been failing.’
    • ‘Come up with a foolproof security system and stop other men like you from stealing priceless works of art.’
    • ‘We must take the initiative with regard to food labelling, with the critical aim of putting in place a foolproof system.’
    • ‘It all adds up to an almost foolproof mechanical length measuring system that Les says produces excellent results.’
    • ‘See that your dive boat has a foolproof checking system, whether in the form of a roll-call or an effective tagging system.’
    • ‘Now we need to make sure that the system is as foolproof as possible.’
    • ‘However, this is not a foolproof system as not all marketing firms are signed-up.’
    • ‘I am writing to assure you that my operation is completely safe and foolproof.’
    • ‘Bee-eaters have worked out a foolproof security system for the nest.’
    • ‘These examples should not be considered foolproof systems or events possible only in developed economies.’
    • ‘Companies that can offer safe and foolproof connections stand to rise to the top.’
    • ‘It's a pretty complex system with some safeguards, but not foolproof, as you know.’
    • ‘While you could just write to random addresses in Timbuktu, we have a foolproof system in place.’
    • ‘The State has yet to fine tune a foolproof system by which accidents can be prevented.’
    infallible, never failing, unfailing, unerring, dependable, reliable, trustworthy, certain, sure, guaranteed, safe, sound, effective, efficacious, tried and tested
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