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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

Perhaps that was a self-negating prophecy, since warnings like his might have helped put the country on alert and prevented attacks.

From The Wall Street Journal ● Sep. 11, 2026

They are still hurting, still missing the loved ones they lost, and they must surely be forever on alert for similar devastations that could come and upend their lives again.

From Salon ● Sep. 11, 2026

Dog owners have been put on alert after suspected palm oil washed up on a Merseyside beach.

From BBC ● Aug. 21, 2026

Clement Boher, a 37-year-old resident, said he and his family had been on alert since he saw plumes of smoke rise about the forest on Sunday night.

From Barron's ● Jul. 13, 2026

Maybe a litde bored, even though my mind and body are on alert.

From "All The Bright Places" by Jennifer Niven

on alert

Example Sentences

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