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Definition of alert:

  1. An alarm from a real or threatened attack; a sudden attack; also, a bugle sound to give warning.
  2. Brisk; nimble; moving with celerity.
  3. Watchful; vigilant; active in vigilance.

Synonyms:

marvelous, agile, consternation, aware, supple, spry, rattling, smart, grand, conscious, intelligent, alarm clock, sleepless, rakish, nippy, open-eyed, awake, natty, appal, lidless, spanking, nipping, frosty, bouncing, jaunty, fresh, refreshing, vigilant, clever, spiffy, appall, insomniac, whipping, horrify, crisp, energetic, nimble, snappy, dapper, wonderful, springy, alertness, alive, alarum, heads-up, raffish, restless, on the job, warning signal, peppy, bouncy, watchful, wondrous, marvellous, ability, howling, festive, perched, spirited, fly, alarm, refreshful, industrious, sharp-witted, keen, on the alert, mirthful, spruce, warning device, bracing, wide-awake, alerting, tocsin, busy, alarm system, racy, perked up, tremendous, zippy, live, fantastic, merry, argus-eyed, jovial, jocund, awareness, festal, perked, resilient, quick, expeditious, jolly, snappish, gay, terrific, tonic, quick-witted, qui vive, bustling, mobile, put on guard, sprightly, officious, bright, full of life, dashing, wakeful.

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