Keen
Keen adjective - Able to sense slight impressions or differences.
Usage example: pilots with especially keen eyesight
Sharp is a synonym for keen in ability topic. In some cases you can use "Sharp" instead the word "Keen" as an adjective or a noun, when it comes to topics like penetrating, acute, characteristic, alert. popular alternative
Sharp
Sharp adjective - Having an edge thin enough to cut or pierce something.
Usage example: be careful, as that knife is sharp enough to slice off a finger
Keen is a synonym for sharp in ability topic. You can use "Keen" instead the word "Sharp" as an adjective or a noun, if it concerns topics such as cold, perceptive, behaviour, alert. popular alternative
Mutual synonyms
Both words in one sentence
- He was also a sharp dresser with a keen eye for the ladies, as he was incredibly- sometimes to the point of being pushy- sympathetic.
Source: Flanderization / Live-Action TV -
The other primary Kakuja user of the series, the One-Eyed Owl, is shown to mentally regress into a giggling lunatic while using its power in sharp contrast to its normally keen mind.
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When you want to show the keen, obsidian-sharp mind of a character at work, or lay out their cunning and complex plans out in a Comic Book, Web Comic or similar media, the best way to do it is with a Rebus Bubble.
Source: Rebus Bubble
Cite this Source
Sharp and Keen. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/keen/sharp
Keen & Sharp. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/keen/sharp>.
Sharp or Keen. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/keen/sharp.
Google Ngram Viewer shows how "keen" and "sharp" have occurred on timeline