1. (noun) alert, qui vive
condition of heightened watchfulness or preparation for action
Synonyms: alarm, warning signal, alarum, alerting, qui vive, alert
Antonyms: unalert, unvigilant, incognizant, lethargic, unenrgetic, unwatchful, unaware
2. (noun) alert, alerting
a warning serves to make you more alert to danger
Synonyms: alarm, warning signal, alarum, alerting, qui vive, alert, alertness
Antonyms: unenrgetic, unalert, unwatchful, incognizant, unaware, unvigilant, lethargic
3. (adj) alarm, alert, warning signal, alarum
an automatic signal (usually a sound) warning of danger
Synonyms: warning device, alarum, warning signal, consternation, alarm clock, alarm, qui vive, alert, alarm system, alerting, dismay
Antonyms: unenrgetic, incognizant, unwatchful, lethargic, unalert, unvigilant, unaware
4. (adj) alert, watchful
engaged in or accustomed to close observation
Synonyms: alive(p), sleepless, spanking, insomniac, alert, zippy, awake(p), brisk, lively, merry, rattling, snappy, watchful
Antonyms: unvigilant, unaware, unenrgetic, unwatchful, unalert, lethargic, incognizant
5. (adj) alert, brisk, lively, merry, rattling, snappy, spanking, zippy
quick and energetic
Synonyms: jovial, natty, marvelous, festive, rattling(a), brisk, wondrous, nipping, peppy, spruce, resilient, mirthful, jocund, frosty, festal, tremendous, grand, marvellous, snappy, live, racy, bouncing, watchful, lively, bouncy, wonderful, dapper, jolly, gay, spanking, springy, alive(p), tonic, fresh, awake(p), nippy, raffish, jaunty, fantastic, alert, merry, terrific, spiffy, rakish, rattling, snappish, howling(a), refreshful, dashing, spirited, full of life, bracing, crisp, whipping, refreshing, zippy, vital
Antonyms: unaware, unvigilant, incognizant, lethargic, unenrgetic, unalert, unwatchful
6. (verb) alert, alive(p), awake(p)
mentally perceptive and responsive;"an alert mind"
Antonyms: lethargic, unaware, incognizant, unalert, unvigilant, unwatchful, unenrgetic
7. (verb) alarm, alert
warn or arouse to a sense of danger or call to a state of preparedness
Synonyms: alarm, dismay, appall, appal, horrify, alert
Antonyms: lethargic, unenrgetic, unalert, unaware, unvigilant, incognizant, unwatchful
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Synonyms and Antonyms of alert 
