"alert" in the noun sense
1. alert, qui vive
condition of heightened watchfulness or preparation for action
"bombers were put on alert during the crisis"
2. alert, alerting
a warning serves to make you more alert to danger
3. alarm, alert, warning signal, alarum
an automatic signal (usually a sound) warning of danger
"alert" in the verb sense
1. alarm, alert
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"
"alert" in the adjective sense
1. alert, watchful
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"
2. alert, brisk, lively, merry, rattling, snappy, spanking, zippy
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. alert, alive, awake
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"
Source: WordNet® (An amazing lexical database of English)
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