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

[ Syn: watchful ]

condition of heightened watchfulness or preparation for action; bombers were put on alert during the crisis

[ Syn: qui vive ]

a warning serves to make you more alert to danger

[ Syn: alerting ]

an automatic signal (usually a sound) warning of danger

[ Syn: alarm , warning signal , alarum ]

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

[ Syn: brisk , lively , merry , rattling , snappy , spanking , zippy ]

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

[ Syn: alive , awake ]

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

[ Syn: alarm ]