Definition of foolproof in US English:

foolproof

adjective

  • Incapable of going wrong or being misused.

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

Pronunciation

foolproof

/ˈfulˌpruf//ˈfo͞olˌpro͞of/