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Definitions

alert

[uh-lurt] / əˈlɜrt /
ADJECTIVE
attentive, lively
Synonyms
STRONGEST
active bright careful intelligent observant perceptive sharp vigilant wary watchful wired wise
STRONG
hip jazzed quick ready spirited
WEAK
all ears cagey circumspect clever fast on the draw good hands heads up heedful on guard on one's toes on the ball on the job on the lookout on the qui vive psyched-up switched on wide-awake with it
Antonyms
STRONGEST
careless dull foolish ignorant inattentive incautious indifferent indiscreet lazy negligent stupid thoughtless unaware unintelligent unobservant
STRONG
slow uneducated
WEAK
asleep drowsy lethargic sluggish weary
NOUN
warning
Synonyms
STRONGEST
alarm signal
STRONG
Mayday SOS admonition flap sign siren wink
WEAK
high sign tip off
VERB
warn
Synonyms
STRONGEST
alarm forewarn inform notify tip off
STRONG
flag signal tip
WEAK
give the high sign put on guard wave flag
Antonyms
STRONGEST
conceal hide

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

It added that a nationwide alert had been issued, with large-scale patrols stepped up and checkpoints reinforced to tighten security.

From BBC • Apr. 26, 2026

In addition to messaging on screens, the Stagecoach app sent an alert for people to evacuate.

From Los Angeles Times • Apr. 25, 2026

The US embassy in Mali issued a security alert on its website urging US citizens in and around the capital to "shelter in place".

From Barron's • Apr. 25, 2026

The alert also included a rough location in the sky.

From Science Daily • Apr. 24, 2026

She jerks awake, alert to fresh scents and sounds.

From "Willodeen" by Katherine Applegate

Vocabulary lists containing alert

The Best Starting Words for Wordle

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Common Five-letter Words for Wordle, List 3

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List 2

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