English dictionary

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English adjective: alert

1. alert engaged in or accustomed to close observation

SamplesCaught by a couple of alert cops.
Alert enough to spot the opportunity when it came.
Constantly alert and vigilant, like a sentinel on duty.


Similarargus-eyed, fly, heads-up, lidless, open-eyed, sleepless, vigilant, wakeful, wide-awake

See alsoawake, lively, wary

Antonymsunalert, unvigilant, unwatchful

2. alert quick and energetic

SamplesA brisk walk in the park.
A lively gait.
A merry chase.
Traveling at a rattling rate.
A snappy pace.
A spanking breeze.

Synonymsbrisk, lively, merry, rattling, snappy, spanking, zippy


Antonymslethargic, unenrgetic

3. alert mentally perceptive and responsive

SamplesAn 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.

Synonymsalive, awake

Similaraware, cognisant, cognizant

Antonymsincognizant, unaware

English noun: alert

1. alert (state) condition of heightened watchfulness or preparation for action

SamplesBombers were put on alert during the crisis.

Synonymsqui vive

Broader (hypernym)preparation, preparedness, readiness

Narrower (hyponym)air alert, red alert, strip alert

2. alert (communication) a warning serves to make you more alert to danger


Broader (hypernym)warning

Instance hyponymEAS, Emergency Alert System

3. alert (communication) an automatic signal (usually a sound) warning of danger

Synonymsalarm, alarum, warning signal

Broader (hypernym)sign, signal, signaling

Narrower (hyponym)air alert, alarm bell, burglar alarm, fire alarm, foghorn, fogsignal, horn, red flag, siren, tocsin, torpedo

English verb: alert

1. alert (communication) warn or arouse to a sense of danger or call to a state of preparedness

SamplesThe empty house alarmed him.
We alerted the new neighbors to the high rate of burglaries.


Pattern of useSomebody ----s somebody.
Something ----s somebody

Broader (hypernym)warn

Narrower (hyponym)wake

Based on WordNet 3.0 copyright © Princeton University.
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