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

Pronunciation

foolproof

/ˈfulˌpruf//ˈfo͞olˌpro͞of/