alertness

Definitions

The quality of being quick to notice any unusual and potentially dangerous or interesting circumstances.

The state of being fully awake and aware of one's surroundings.

The ability to respond quickly and effectively to stimuli.

Examples

The driver's constant alertness prevented a serious accident on the highway.

Drinking a cup of coffee in the morning helps improve my mental alertness throughout the day.

Synonyms

vigilance attentiveness awareness sharpness watchfulness readiness keenness

Antonyms

lethargy inattentiveness drowsiness apathy unawareness sluggishness indifference