Alert
Alert adjective - Paying close attention usually for the purpose of anticipating approaching danger or opportunity.
Usage example: she needed to stay alert throughout the train ride so as not to miss her stop
Sharp is a synonym for alert in ability topic. In some cases you can use "Sharp" instead the word "Alert" as an adjective or an adverb, when it comes to topics like quick-witted, characteristic, attentive, shrewd.
Sharp
Sharp adjective - Having or showing a practical cleverness or judgment.
Usage example: a sharp customer who wasn't about to be taken in by that smooth-tongued salesman
Alert is a synonym for sharp in ability topic. You can use "Alert" instead the word "Sharp" as an adjective or an adverb, if it concerns topics such as perceptive, behaviour, character trait, shrewd.
Mutual synonyms
Both words in one sentence
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Sliding Scale of Silliness Versus Seriousness: This series gets progressively more serious, in sharp contrast to the Red Alert series.
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Not only are they unrusted and sharp, their orc proximity alert is still active.
Source: Precursors - In a crowd full of individuals with spaced gazes and relaxed facial expressions, only a Sharp-Dressed Man with a parasol seems alert, with a perfect erect posture.
Cite this Source
Sharp and Alert. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/alert/sharp
Alert & Sharp. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/alert/sharp>.
Sharp or Alert. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/alert/sharp.
Google Ngram Viewer shows how "alert" and "sharp" have occurred on timeline