alert

1. Engaged in or accustomed to close observation (synset 300092165)
   "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"
   also:

   • wary - marked by keen caution and watchful prudence
   • awake - not in a state of sleep; completely conscious
   • lively - full of life and energy
   similar to:

   • argus-eyed, open-eyed, vigilant, wakeful - carefully observant or attentive; on the lookout for possible danger
   • fly - (British informal) not to be deceived or hoodwinked
   • heads-up, wide-awake - fully alert and watchful
   • lidless, sleepless - always watchful
   same as: watchful
2. Quick and energetic (synset 300877534)
   "a brisk walk in the park"; "a lively gait"; "a merry chase"; "traveling at a rattling rate"; "a snappy pace"; "a spanking breeze"
   similar to: energetic - possessing or exerting or displaying energy
   same as: brisk, lively, merry, rattling, snappy, spanking, zippy
3. Mentally perceptive and responsive (synset 300192141)
   "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"
   similar to: aware, cognisant, cognizant - (sometimes followed by `of') having or showing knowledge or understanding or realization or perception
   same as: alive, awake

1. Condition of heightened watchfulness or preparation for action (synset 114055142)
   "bombers were put on alert during the crisis"
   is a type of: preparation, preparedness, readiness - the state of having been made ready or prepared for use or action (especially military action)
   subtypes:

   • air alert - the condition in which combat aircraft are airborne and ready for an operation
   • red alert - the highest level of alert when an attack by the enemy seems imminent (or more generally a state of alert resulting from imminent danger)
   • strip alert - a state of readiness for domestic defense aircraft
   same as: qui vive
2. A warning serves to make you more alert to danger (synset 107239434)
   is a type of: warning - a message informing of danger
   specific instances: eas, emergency alert system - a federal warning system that is activated by FEMA; enables the President to take over the United States airwaves to warn the whole country of major catastrophic events
   same as: alerting
3. An automatic signal (usually a sound) warning of danger (synset 106816015)
   is a type of: sign, signal, signaling - any nonverbal action or gesture that encodes a message
   subtypes:

   • torpedo - a small explosive device that is placed on a railroad track and fires when a train runs over it; the sound of the explosion warns the engineer of danger ahead
   • air alert - the warning signal that begins a period of preparation for an enemy air attack
   • burglar alarm - a loud warning signal produced by a burglar alarm
   • fire alarm - a shout or bell to warn that fire has broken out
   • foghorn, fogsignal - a loud low warning signal that can be heard by fogbound ships
   • horn - a noise made by the driver of an automobile to give warning
   • red flag - a flag that serves as a warning signal
   • siren - a warning signal that is a loud wailing sound
   • alarm bell, tocsin - the sound of an alarm (usually a bell)
   same as: alarm, alarum, warning signal

1. Warn or arouse to a sense of danger or call to a state of preparedness (synset 200874096)
   "The empty house alarmed him"; "We alerted the new neighbors to the high rate of burglaries"
   is a type of: warn - notify of danger, potential harm, or risk
   subtypes: wake - make aware of
   same as: alarm

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