ALERTNESS Synonyms: 66 Similar and Opposite Words

alertness

noun

Definition of alertness

as in carefulness

a close attentiveness to avoiding danger drove through the fog with extra alertness, as the road signs repeatedly warned of deer and moose crossings

Synonyms & Similar Words

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Antonyms & Near Antonyms

as in watchfulness

the state of being constantly attentive and responsive to signs of opportunity, activity, or danger we observed the U.S. border patrol's intensified alertness for drug smugglers at the border stations

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Antonyms & Near Antonyms

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

Recent Examples of alertness Ellen displays intimacy with Lara in front of Ruby; Lara withholds and then offers attention; Ruby watches with envy, desire, and the alertness of a guest who cannot tell whether she is being welcomed or appraised. — Literary Hub, 24 Sep. 2026 Kratom products contain chemicals that can increase alertness, physical energy, and talkativeness. — Ivan Pereira, ABC News, 23 Sep. 2026 This clock determines your body’s daily cycle of sleep and alertness—the circadian rhythm. — Jd Shadel, Condé Nast Traveler, 22 Sep. 2026 Nicotine acts on many of the same nicotinic acetylcholine receptors that normally respond to acetylcholine, temporarily increasing alertness, attention and arousal. — Hasmeena Kathuria, The Conversation, 22 Sep. 2026 Specialized cells in the eyes detect changes in light and communicate with the brain’s circadian system, helping coordinate processes such as alertness and sleep. — Ascend Agency, New York Daily News, 11 Sep. 2026 Drinking water in the morning may improve alertness and reaction speed. — Merve Ceylan, HEALTH, 8 Sep. 2026 The alertness of adults (parents and lawmakers) as well as more mature teens to private sector accountability helps. — The Christian Science Monitor, Christian Science Monitor, 31 Aug. 2026 To achieve this, the locus coeruleus continuously alternates between tonic activity—governing baseline arousal and alertness—and brief phasic bursts that focus attention on critical events. — Julian Hayes Ii, Forbes.com, 23 Aug. 2026

Recent Examples of Synonyms for alertness

Noun

This carefulness is clearly strategic.

— Gary Sernovitz, New Yorker, 15 June 2026
There was no carefulness in it.

— Zack Meisel, New York Times, 1 May 2026

Definition of carefulness

Noun

Chemical peels This caution about many skin-care acids extends to chemical peels, which are usually made from a combination of acids in high concentrations.

— Kara McGrath, Allure, 22 Oct. 2026
Given the Muse success, one of our causes for caution coming into the print was the related increase in costs needed to get the AI agent to full ramp.

— Zev Fima, CNBC, 22 Oct. 2026

Definition of caution

Noun

The advisories urged Americans to exercise vigilance and prepare for possible flight cancellations, airspace closures and other travel disruptions.

— Olivia Gazis, CBS News, 20 Oct. 2026
This method works only as long as employees exercise constant vigilance—over the machines, themselves, and one another.

— Gideon Lewis-Kraus, New Yorker, 19 Oct. 2026

Definition of vigilance

Noun

Those figures largely predate the state’s move to universal free child care, which began in November 2025 and is funded by an oil and gas windfall.

— Martie Bowser, Fortune, 24 Oct. 2026
In a bucket hat and without a care in the world, Murray speaks kindly but candidly about making his buddy Coyne’s TV dream come true.

— Tony Maglio, HollywoodReporter, 24 Oct. 2026

Definition of care

Noun

The alert is for Western San Gabriel Mountains and Highway 14 Corridor, Eastern San Gabriel Mountains, Western Antelope Valley Foothills, Eastern Antelope Valley Foothills and Antelope Valley.

— CA Weather Bot, Sacbee.com, 24 Oct. 2026
The warning signs, and state response In May, the North American Electric Reliability Corporation issued a Level 3 alert, its most serious, warning that sudden swings in data center demand threaten the stability of the grid.

— Neil Chatterjee, Fortune, 23 Oct. 2026

Definition of alert

Browse Nearby Words

alerting

alertness

alerts

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“Alertness.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/alertness. Accessed 28 Oct. 2026.

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Synonyms of alertness

noun

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