1
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
Relevance
Antonyms & Near Antonyms
2
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
Synonyms & Similar Words
Antonyms & Near Antonyms
Example Sentences
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Recent Examples of alertness
At the same time, those who are well-hydrated before bed and again in the morning tend to experience improvements in alertness and reaction speed.
—
Cristina Mutchler,
Verywell Health,
19 June 2026
Your chronotype is driven by the circadian rhythm, the body's internal clock that regulates sleep, alertness, and other daily functions, explains Jennifer Martin, a professor at Florida International University's College of Medicine.
—
Olivia McIntosh,
Martha Stewart,
15 June 2026
The body adapts to the daily dose, blunting caffeine’s impact on blood pressure, mental alertness and exercise performance.
—
Samantha Agate,
Charlotte Observer,
13 June 2026
High-energy visible light plays a role in alertness, memory, cognitive function and mood regulation, and it is even used as a treatment for Seasonal Affective Disorder, according to the Raleigh Eye Center.
—
Samantha Agate,
Sacbee.com,
13 June 2026
Depending on your tolerance, this could be too much—or just the right amount—to help increase alertness.
—
Allison Forsyth,
Health,
12 June 2026
Adrenaline and noradrenaline, hormones which increase alertness and reaction speed, are also released, but there is a fine balance between readiness and unreadiness.
—
Charlotte Harpur,
New York Times,
3 June 2026
Promotes alertness through the same pathway as outdoor light.
—
Allison Palmer
june 2,
Fort Worth Star-Telegram,
2 June 2026
This increases alertness, boosts available energy and temporarily downshifts nonessential functions like digestion.
—
Daryl Austin,
USA Today,
30 May 2026
Cristina Mutchler,
Verywell Health,
19 June 2026
Your chronotype is driven by the circadian rhythm, the body's internal clock that regulates sleep, alertness, and other daily functions, explains Jennifer Martin, a professor at Florida International University's College of Medicine.
—
Olivia McIntosh,
Martha Stewart,
15 June 2026
The body adapts to the daily dose, blunting caffeine’s impact on blood pressure, mental alertness and exercise performance.
—
Samantha Agate,
Charlotte Observer,
13 June 2026
High-energy visible light plays a role in alertness, memory, cognitive function and mood regulation, and it is even used as a treatment for Seasonal Affective Disorder, according to the Raleigh Eye Center.
—
Samantha Agate,
Sacbee.com,
13 June 2026
Depending on your tolerance, this could be too much—or just the right amount—to help increase alertness.
—
Allison Forsyth,
Health,
12 June 2026
Adrenaline and noradrenaline, hormones which increase alertness and reaction speed, are also released, but there is a fine balance between readiness and unreadiness.
—
Charlotte Harpur,
New York Times,
3 June 2026
Promotes alertness through the same pathway as outdoor light.
—
Allison Palmer
june 2,
Fort Worth Star-Telegram,
2 June 2026
This increases alertness, boosts available energy and temporarily downshifts nonessential functions like digestion.
—
Daryl Austin,
USA Today,
30 May 2026
Recent Examples of Synonyms for alertness
Noun
-
This carefulness is clearly strategic.
-
There was no carefulness in it.
Noun
-
But the book’s ruminative watchfulness is unsuccessfully conjugated in this overly sedate play with music, which has the feel of a song cycle, though sung by the fine cast with gorgeous, lonely sorrow.
-
Hong Kong icon Tony Leung has channeled brooding urban energy for the masterpieces of Wong Kar-Wai, balancing the debonair ennui of Marcello Mastroianni with the quiet watchfulness of Montgomery Clift.
Noun
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Onboard of Connor Zilisch spotting Patrick Mahomes in the crowd under caution.
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Experts, however, urge caution.
Noun
-
In summary, when facing the threat of lightning, preparedness and vigilance are your best allies.
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Research on stress and cognitive load has shown that ambiguity activates many of the same neural pathways involved in threat detection and vigilance.
Noun
-
If CosRx can convince people to willingly slather snail mucin on their faces, trusting the brand with hair care is a pretty easy next step.
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Women are far more likely than men to leave the workforce to take care of children or aging parents.
Noun
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The women, who also wore Mexico jerseys, were planning to attend the watch party.
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The devices were hidden in a pack of cigarettes, the informant’s watch, and a cellphone.
Noun
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Considering there were only 33 appearances this past season, such Heat prudence hardly could be viewed as insulting.
-
This is how a title is won, with prudence and luck and a foresight that becomes apparent in the afterglow of victory.
Noun
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At Dry Creek Ranch, however, the dogs produced enough alerts to prompt investigators to begin digging.
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Jim waits 45 minutes after sending a trade alert before buying or selling a stock in his charitable trust's portfolio.
Cite this Entry
“Alertness.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/alertness. Accessed 28 Jun. 2026.
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