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on alert

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.

The Soviet foreign minister, Andrei Gromyko, observed at the time: “Americans put forces on alert so often that it is hard to know what it means.”

From Slate • Apr. 21, 2026

On Sunday morning internal health service communications went out across Kent and Medway informing services of the outbreak, so NHS 111, local A&Es and GPs were on alert for cases.

From BBC • Mar. 24, 2026

The private-credit industry has been on alert since the defaults last year of Tricolor and First Brand that prompted JPMorgan CEO Jamie Dimon to warn of “cockroaches” in the market for privately held loans.

From MarketWatch • Mar. 12, 2026

A Glendale nurse practitioner is warning area residents to be on alert for a mountain lion that attacked and dragged away her dog Monday evening just outside her home.

From Los Angeles Times • Feb. 25, 2026

The last day of fifth grade, Cat was on alert.

From "Caterpillar Summer" by Gillian McDunn

on alert

Example Sentences

Related Words