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alertness

  • a word derived from alert.
    alert
    adjective
    fully aware and attentive; wide-awake; keen.

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.

See Examples For:

Vrancken's alertness and decisiveness may have saved a vulnerable Magnusson a more troubling fate.

From BBC ● Nov. 1, 2026

The condition is also marked by dramatic fluctuations in alertness that occur within hours of the same day.

From Los Angeles Times ● Oct. 30, 2026

Caffeine can temporarily increase alertness and make fatigue feel less noticeable.

From Science Daily ● Sep. 22, 2026

In a small study on people with insomnia, when they were given a false negative sleep score, those individuals reported sleepiness and fatigue, as well as lower levels of alertness and clear thinking.

From Slate ● Aug. 11, 2026

A jot of alertness came into his face.

From "Nine Stories" by J. D. Salinger