FluentPlex

keen

/kin/ verb C2
  1. To utter a keen. (intransitive)
  2. To utter with a loud wailing voice or wordless cry. (transitive)
  3. To mourn. (transitive)

He/she/it keens · Past keened · Past participle keened · -ing form keening

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Verb forms

Base form
keen
He/she/it
keens
Past
keened
Past participle
keened
-ing form
keening

From the library

In age he may have been about fifty, with a strong-jawed, rugged face, a grizzling moustache, peculiarly keen gray eyes, and a wiry, vigorous figure which had lost nothing of the strength and activity of youth.
The Valley of Fear, p. 23 · C1
Holmes had sat intently observant during this long discussion, missing no word that was said, with his keen eyes darting to right and to left, and his forehead wrinkled with speculation.
The Valley of Fear, p. 43 · C1
On these his eager, questioning eyes were fixed, and I saw on his keen, alert face that tightening of the lips, that quiver of the nostrils, and concentration of the heavy, tufted brows which I knew so well.
Sherlock Holmes: The Bruce-Partington Plans, p. 14 · B2
All the afternoon he sat in the stalls wrapped in the most perfect happiness, gently waving his long, thin fingers in time to the music, while his gently smiling face and his languid, dreamy eyes were as unlike those of Holmes the sleuth-hound, Holmes the relentless, keen-witted, ready-handed criminal agent, as it was possible to conceive.
The Adventures of Sherlock Holmes, p. 21 · B2

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.