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on alert

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on call adj.
vigilant adj.

ADJECTIVE

on call

Synonyms

WEAK

accessible at hand at one's beck and call at one's disposal at one's fingertip available handy night call on deck on-the-spot prepared standing by within reach

ADJECTIVE

vigilant

Synonyms

STRONGEST

anxious attentive aware cautious circumspect keen observant wary

WEAK

acute agog alert guarded looking for looking to on guard on the ball on the job on the lookout on the qui vive on toes open-eyed sharp sleepless unsleeping waiting on wakeful wide-awake with eyes peeled with weather eye open

Antonyms

STRONGEST

careless heedless ignorant inattentive incautious indifferent indiscreet rash thoughtless unaware uncareful unobservant

WEAK

impulsive negligent

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.

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on alert

The stock-market veteran putting investors on alert is Kevin Muir, author of The MacroTourist newsletter and formerly a derivative trader at RBC Capital Markets and Wintor Capital.

From MarketWatch ● Jul. 2, 2026

German forecasters said parts of the country needed to be on alert for thunderstorms, hail and heavy rain over the weekend.

From Barron's ● Jun. 19, 2026

But for now, players and medical staff are on alert.

From Los Angeles Times ● Jun. 14, 2026

Asking me not to disclose her full name, Lisa explained how residents remained on alert and used whistles to warn others if immigration agents were seen nearby.

From BBC ● May 7, 2026

Whether or not a human knew what they were, an instinct inside them knew to be on alert, to be just a little afraid.

From "Night Owls" by A.R. Vishny

on alert

Example Sentences

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