Definition of vigilant in US English:



  • Keeping careful watch for possible danger or difficulties.

    ‘the burglar was spotted by vigilant neighbors’
    • ‘Dog owners should be extremely vigilant and wary of anyone showing an unusual interest in their pet.’
    • ‘So the entrepreneur is always vigilant for ways of improving product performance and reducing costs.’
    • ‘London remains on a high state of alert and everyone needs to be vigilant, said Sir John.’
    • ‘I would appeal to people to be vigilant and report any suspicious behaviour near farms.’
    • ‘Of course you should be vigilant with your finances and budget carefully but hoarding money is not the answer.’
    • ‘Once again, we appeal to the community to be vigilant and to keep a watchful eye out for the elderly.’
    • ‘Also we ask all parishioners to be vigilant and keep a watchful eye on this amenity.’
    • ‘We were warned to be vigilant and wary of those who continue to seek dominance over others.’
    • ‘As women we need to remain vigilant and watch how our South African Constitution is put into practice.’
    • ‘We have to remain ever vigilant and issue extra advice to their offices on the possible risk of an anthrax attack.’
    • ‘For unless you are vigilant and eagle eyed, you may not spot a fake note at the right time.’
    • ‘We are also urged to be vigilant for suspicious behaviour, vehicles and packages.’
    • ‘As a community we need to be on our guard, and remain vigilant to try to combat this problem.’
    • ‘We must keep alert and vigilant to the future plans of the developers.’
    • ‘Continue to go about your day-to-day business in the normal way, but remain alert and vigilant.’
    • ‘In other words, unions and their members need to continue to be wary and vigilant.’
    • ‘Meanwhile, we can all play our part by remaining vigilant and reporting suspicious behaviour.’
    • ‘We were warned to be vigilant and alert to what the road users around us were doing.’
    • ‘He also urged individuals to be vigilant in watching for offenders and to report them to their local councillor.’
    • ‘Yes I do agree that parents should be vigilant in what they let their children watch.’
    watchful, on the lookout, observant, sharp-eyed, keen-eyed, gimlet-eyed, eagle-eyed, hawk-eyed, with eyes like a hawk, with one's eyes open, keeping one's eyes peeled, keeping one's eyes skinned, attentive, paying attention, alert, on the alert, on one's toes, on the qui vive
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Late 15th century: from Latin vigilant- ‘keeping awake’, from the verb vigilare, from vigil (see vigil).