alert

'alert'

Examples:
bombers were put on alert during the crisis

'alert'

'alert'

'alert'

Examples:
The empty house alarmed him
We alerted the new neighbors to the high rate of burglaries

'alert'

Examples:
caught by a couple of alert cops
alert enough to spot the opportunity when it came
constantly alert and vigilant, like a sentinel on duty

'alert'

Examples:
a brisk walk in the park
a lively gait
a merry chase
traveling at a rattling rate
a snappy pace
a spanking breeze

'alert'

Examples:
an alert mind
alert to the problems
alive to what is going on
awake to the dangers of her situation
was now awake to the reality of his predicament