vigilant

word

Definition

Being careful and watchful, especially to notice danger or problems quickly.

Usage & Nuances

'Vigilant' is formal and often used when someone is watching for danger, like security or parenting. Common with 'remain', 'stay', or 'keep': 'stay vigilant'. Not used for casual attention or daydreaming; stronger than just 'attentive'.

Example Sentences

Even when things seem calm, it's wise to stay vigilant.

natural

Hackers are everywhere, so always be vigilant online.

natural

She stayed vigilant for any signs of trouble during the protest.

natural

The security guard was vigilant all night.

basic

Parents should be vigilant when children are near water.

basic

You must remain vigilant while driving at night.

basic