Keen
Keen adjective - Able to sense slight impressions or differences.
Usage example: pilots with especially keen eyesight
Quick is a synonym for keen in ability topic. In some cases you can use "Quick" instead an adjective "Keen", when it comes to topics like characteristic, alert, intelligent, discerning.
Quick
Quick adjective - Having or showing the ability to respond without delay or hesitation.
Usage example: she's a quick wit, always ready with a pun or joke when the moment calls for one
Keen is a synonym for quick in ability topic. You can use "Keen" instead an adjective "Quick", if it concerns topics such as characteristic, alert, fast, sharp.
Mutual synonyms
Both words in one sentence
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This is also why Victoria is so keen on bilking Millie out of her family fortune, rather than going for simpler get-rich-quick schemes.
Source: Roleplay / The Shadow Of Greed - Despite Elvin and Adair from Andraste both having female love interests, Adair has a very keen interest in Elvin's injuries (expressing even greater concern than Elvin's love interest) and is suspiciously quick to stand up for him.
Source: Ho Yay / Literature -
She's not as quick as her friends to believe in things like curses or predicting the future, though she's right ("Bridle Gossip") as often as she is wrong ("Feeling Pinkie Keen").
Source: Agent Scully
Cite this Source
Quick and Keen. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/keen/quick
Keen & Quick. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/keen/quick>.
Quick or Keen. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/keen/quick.
Google Ngram Viewer shows how "keen" and "quick" have occurred on timeline