alert
Definitions
Quick to notice any unusual and potentially dangerous or difficult circumstances; vigilant.
An announcement or signal that warns of danger, an emergency, or a specific event.
To warn someone of a danger, threat, or problem.
Examples
The security system sent an alert to my phone when it detected motion.
The lifeguard remained alert, scanning the pool for any signs of trouble.
The government issued a weather alert warning residents of the approaching storm.
Synonyms
Antonyms
asleep drowsy inattentive oblivious lethargic unaware distracted