Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun alert

3 senses of alert

Sense 1
alert, qui vive -- (condition of heightened watchfulness or preparation for action; "bombers were put on alert during the crisis")
       => readiness, preparedness, preparation -- (the state of having been made ready or prepared for use or action (especially military action); "putting them in readiness"; "their preparation was more than adequate")

Sense 2
alert, alerting -- (a warning serves to make you more alert to danger)
       => warning -- (a message informing of danger; "a warning that still more bombs could explode")

Sense 3
alarm, alert, warning signal, alarum -- (an automatic signal (usually a sound) warning of danger)
       => signal, signaling, sign -- (any nonverbal action or gesture that encodes a message; "signals from the boat suddenly stopped")

Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb alert

1 sense of alert

Sense 1
alarm, alert -- (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")
       => warn -- (notify of danger, potential harm, or risk; "The director warned him that he might be fired"; "The doctor warned me about the dangers of smoking")

Antonyms of adj alert

3 senses of alert

Sense 1
alert (vs. unalert), watchful -- (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")

unalert (vs. alert), unwatchful, unvigilant -- (not alert to what is potentially dangerous)

Sense 2
alert, brisk, lively, merry, rattling, snappy, spanking, zippy -- (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")

INDIRECT (VIA energetic) -> lethargic, unenrgetic -- (deficient in alertness or activity; "bullfrogs became lethargic with the first cold nights")

Sense 3
alert, alive (predicate), awake (predicate) -- (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")

INDIRECT (VIA aware) -> unaware, incognizant -- ((often followed by `of') not aware; "seemed unaware of the scrutiny"; "unaware of the danger they were in"; "unaware of the newborn hope"; "the most unaware person I've known")

Similarity of adj alert

3 senses of alert

Sense 1
alert (vs. unalert), watchful -- (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")
       => argus-eyed, open-eyed, vigilant, wakeful -- (carefully observant or attentive; on the lookout for possible danger; "a policy of open-eyed awareness"; "the vigilant eye of the town watch"; "there was a watchful dignity in the room"; "a watchful parent with a toddler in tow")
       => fly -- ((British informal) not to be deceived or hoodwinked)
       => heads-up, wide-awake -- (fully alert and watchful; "played heads-up ball")
       => lidless, sleepless -- (always watchful; "to an eye like mine, a lidless watcher of the public weal"- Alfred Tennyson)
          Also See-> awake#1; lively#1; wary#1

Sense 2
alert, brisk, lively, merry, rattling, snappy, spanking, zippy -- (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")
       => energetic (vs. lethargic) -- (possessing or exerting or displaying energy; "an energetic fund raiser for the college"; "an energetic group of hikers"; "it caused an energetic chemical reaction")

Sense 3
alert, alive (predicate), awake (predicate) -- (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")
       => aware (predicate) (vs. unaware), cognizant, cognisant -- ((sometimes followed by `of') having or showing knowledge or understanding or realization or perception; "was aware of his opponent's hostility"; "became aware of her surroundings"; "aware that he had exceeded the speed limit")