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The dog was vigilant and barked at strangers.
Always watching for danger or problems.
The security guard remained vigilant throughout the night.
She was vigilant about keeping her children safe.
The lifeguard was vigilant, watching the swimmers closely.
vigilant watch
vigilant eye
vigilant observer
alert
watchful
attentive
The vigilant kept an eye on the crowd.
A person who is watchful and alert.
The vigilant guard watched the entrance closely.
She remained vigilant during the hike, looking out for any signs of danger.
The vigilant teacher noticed when a student was struggling.
vigilant observer
vigilant eye
vigilant stance
watchful
alert
attentive