alert

/ə'lə:t/
Adjective
  1. mentally perceptive and responsive
    • 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
  2. quick and energetic
    • a brisk walk in the park
    • a lively gait
    • a merry chase
    • traveling at a rattling rate
    • a snappy pace
    • a spanking breeze
  3. engaged in or accustomed to close observation
    • 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
Noun
  1. an automatic signal (usually a sound) warning of danger
  2. a warning serves to make you more alert to danger
  3. condition of heightened watchfulness or preparation for action
    • bombers were put on alert during the crisis
Verb
  1. warn or arouse to a sense of danger or call to a state of preparedness
    • The empty house alarmed him
    • We alerted the new neighbors to the high rate of burglaries

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alert
A security guard remains alert during his night shift.