Alert
Alert adjective - Having or showing quickness of mind.
Usage example: an alert and well-trained sheep dog who can handle difficult situations
Perceptive is a synonym for alert in attentive topic. In some cases you can use "Perceptive" instead an adjective "Alert", when it comes to topics like watchful, quick-witted.
Mutual synonyms
Cite this Source
Perceptive and Alert. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/alert/perceptive
Alert & Perceptive. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/alert/perceptive>.
Perceptive or Alert. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/alert/perceptive.
Google Ngram Viewer shows how "alert" and "perceptive" have occurred on timeline