ALERTNESS Synonyms: 66 Similar and Opposite Words

alertness

noun

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

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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 Norepinephrine is tied closely to alertness and cognitive focus, which helps explain why participants in cold-exposure studies often report heightened mental clarity right after immersion. —

Samantha Agate, Charlotte Observer, 30 Apr. 2026 More evidence is needed to determine if smelling lemon water can significantly increase energy and alertness. —

Carrie Madormo, Verywell Health, 17 Apr. 2026 Dogs bred for alertness or reactivity may be more attuned to sound, though this isn’t a hard-and-fast rule. —

Jamie Cuccinelli, Martha Stewart, 7 Apr. 2026 Sleep medications; muscle relaxants; antipsychotic medicines, and antiseizure drugs, all of which may reduce alertness or coordination. —

Amanda Greenwood, MSNBC Newsweek, 1 Apr. 2026 However its active compounds, which can trigger euphoria or alertness, are technically listed as psychotropic substances, creating a complex legal gray area in Kenya. —

Joseph Maina, semafor.com, 27 Mar. 2026 Human tissues can respond to light in ways that extend beyond vision — through photoreceptor signalling in the eye that regulates circadian rhythms, mood, alertness and other functions, as well as through light-sensitive metabolic processes in cells. —

Lynne Peeples, Scientific American, 26 Mar. 2026 The panel that issued the 2024 report, also urged the FAA to further study how alertness and fatigue are monitored — and underscored concerns that consolidating responsibilities can reduce safety margins at exactly the wrong time. —

Alexandra Skores, CNN Money, 26 Mar. 2026 In the earliest of these changes, a tangled version of a protein called tau starts building up in a tiny region deep in the brain involved in sleep, attention and alertness, called the locus coeruleus. —

Elizabeth Riley, The Conversation, 26 Mar. 2026

Recent Examples of Synonyms for alertness

Noun

There was no carefulness in it.

— Zack Meisel, New York Times, 1 May 2026
Organizations can benefit by valuing carefulness and concentration not as an obligation, but as a fundamental pillar of success.

— Heather V. MacArthur, Forbes.com, 22 Jan. 2026