Alert
Alert noun - The state of being constantly attentive and responsive to signs of opportunity, activity, or danger.
Usage example: the doctor told the patient to be on the alert for any signs of infection
Alertness and alert are semantically related in vigilance topic. In some cases you can use "Alertness" instead a noun "Alert", when it comes to topics like caution.
Alertness
Alertness noun - The state of being constantly attentive and responsive to signs of opportunity, activity, or danger.
Usage example: we observed the U.S. border patrol's intensified alertness for drug smugglers at the border stations
Alert and alertness are semantically related in caution topic. Sometimes you can use "Alert" instead a noun "Alertness", if it concerns topics such as vigilance.
How words are described
| full | full alert | full alertness |
| mental | mental alert | mental alertness |
| surprising | surprising alert | surprising alertness |
Cite this Source
Alertness and Alert. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/alert/alertness
Alert & Alertness. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/alert/alertness>.
Alertness or Alert. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/alert/alertness.
Google Ngram Viewer shows how "alert" and "alertness" have occurred on timeline