Usage Note
Vigilant agrees in gender and number: feminine vigilante, plural vigilants/vigilantes. It is slightly more formal than attentif and often appears in security, parenting, and civic contexts (rester vigilant face aux arnaques = 'stay alert to scams'). The related noun vigilance is widely used in official warnings and safety campaigns.
Examples
"Les parents doivent rester vigilants en ligne."
Natural Translation
Parents must stay vigilant online.

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