...The edge of virtue once dulledis never quite so keen afterwards... 
James W. Donovan 「Don't Marry」
...“So it is,” said Cardenio; “and so uncommon and unexampled, that were oneto attempt to invent and concoct it in fiction, I doubt if there be anywit keen enough to imagine it...
Miguel de Cervantes 「The History of Don Quixote, Vol. I, Complete」
... “Well, I would think so,” says I; “for he was as keen as any of the rest at the beginning...
Robert Louis Stevenson 「Kidnapped」
...The laugh which accompanied this sally sounded perhaps a trifle forced andhard, but neither Sir Andrew nor Lord Tony were very keen observers...
Baroness Orczy 「The Scarlet Pimpernel」
...“Ah! my dear lady, pardon me, but that is just what we cannot very welldo,” said Chauvelin, whilst once again his eyes, keen as those of a foxon the alert, darted a quick glance at Marguerite...
Baroness Orczy 「The Scarlet Pimpernel」
...He noted that Sir Percy and Lady Blakeney hadnot yet arrived, and his keen, pale eyes glanced quickly towards the door everytime a newcomer appeared...
Baroness Orczy 「The Scarlet Pimpernel」
...Marguerite had not even tried to see Chauvelin during this last hour; she knewthat his keen, fox-like eyes would terrify her at once, and incline the balanceof her decision towards Armand...
Baroness Orczy 「The Scarlet Pimpernel」
...But the keen brain, which had planned and carried through so many daring plots,was too far-seeing to take unnecessary risks...
Baroness Orczy 「The Scarlet Pimpernel」
... Sapt looked at me with his small keen eyes...
Anthony Hope 「The Prisoner of Zenda」
...The keen air had whipped so much of her cheeks as was presented to it, and seemed to have added sparkle to eyes that were of darkest blue...
Rafael Sabatini 「Scaramouche」
...His keen glance played over Andre-Louis from head to foot...
Rafael Sabatini 「Scaramouche」
... The dark, keen eyes conned him more searchingly...
Rafael Sabatini 「Scaramouche」
...De Wardes had that keen and merciless penetration most evil natures possess; he had immediately remarked De Guiche’s melancholy, and divined the nature of his regard for the princess...
Alexandre Dumas, Pere 「Ten Years Later」
...“I am putting you to inconvenience,” he continued, fixing a keen glace upon the poor governor; “if I had known that, I should not have come...
Alexandre Dumas, Pere 「Ten Years Later」
... From beneathshaggy, beetling brows they glared maliciously upon him, maliciouslyand with a keen curiosity; then Tarzan entered the cabin and closed thedoor after him...
Edgar Rice Burroughs 「Jungle Tales of Tarzan」
...He sniffed the bole of the tree, and with his keen eyes he sought tofind upon the bark some sign of the way the quarry had taken...
Edgar Rice Burroughs 「Jungle Tales of Tarzan」
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