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alert

alert - adjective

  1. Vigilantly attentive: observant, open-eyed, vigilant, wakeful, wary, watchful, wide-awake. See awareness.
  2. Mentally quick and original: bright, clever, intelligent, keen, quick, quick-witted, sharp, sharp-witted, smart. See ability.

alert - noun

  1. A signal that warns of imminent danger: alarm, alarum, tocsin, warning. See warn.

alert - verb

  1. To notify (someone) of imminent danger or risk: admonish, alarm, caution, forewarn, warn. See warn.