alert
adjective
1. 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
Similar word(s): vigilant, wakeful, fly, lidless, sleepless, wary, awake, lively, watchful
2. quick and energetic
Similar word(s): energetic, brisk, lively, merry, rattling, snappy, spanking, zippy
3. mentally perceptive and responsive
- an alert mind
- alert to the problems
noun
1. condition of heightened watchfulness or preparation for action
- bombers were put on alert during the crisis
Definition categories: state, preparation, preparedness, readiness
2. a warning serves to make you more alert to danger
Similar word(s): alerting
Definition categories: communication, warning
3. an automatic signal (usually a sound) warning of danger
Similar word(s): alarm, alarum
Definition categories: communication, sign, signal, signaling
verb
1. warn or arouse to a sense of danger or call to a state of preparedness
- We alerted the new neighbors to the high rate of burglaries
Similar word(s): alarm
Definition categories: communication, warn