...The edge of virtue once dulledis never quite so keen afterwards... 
James W. Donovan 「Don't Marry」
..."And each one will feel deep within him that he has done a great,commendable and original thing!" Mich'l added, with keen insight...
Various 「Astounding Stories, August, 1931」
...Sight andscent became remarkably keen, while his hearing developed such acuteness thatin his sleep he heard the faintest sound and knew whether it heralded peace orperil...
Jack London 「The Call of the Wild」
...Gallardo, as though he felt that his person preserved the keen stench ofthe misery of his earlier years, perfumed himself with offensiveprofusion...
Vicente Blasco Ibáñez Frances Douglas 「The Blood of the Arena」
...“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」
...Suddenly she saw the keen, fox-like face of Chauvelin peepingthrough the curtained doorway...
Baroness Orczy 「The Scarlet Pimpernel」
...It was strange that through all her troubles, all her anxiety for Armand, shewas mostly conscious at the present moment of a keen and bitter heartache...
Baroness Orczy 「The Scarlet Pimpernel」
...Only the most firm resolution kept her from totally breaking down, and thusadding to the young man’s anxiety, which evidently had become very keen...
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」
... The Gascon, however, was a man of calm self-possession; and no sooner did he touch his bright steel blade, than he knew how to adopt morally the cold, keen weapon as his guide of action...
Alexandre Dumas, Pere 「The Man in the Iron Mask」
... “Then I'll take leave to marvel that with so keen a nose your lordship can't smell a papist at four paces...
Rafael Sabatini 「Captain Blood」
...His lordship looked at that keen, intrepid face gleaming lividly in the light of the great poop lantern, and his own eyes were troubled...
Rafael Sabatini 「Captain Blood」
... The dark, keen eyes conned him more searchingly...
Rafael Sabatini 「Scaramouche」
... “A great deal can be seen with observation as keen as yours,” said Fouquet; at which D’Artagnan bowed...
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」
... Harvey was a very adaptable person, with a keen eye and ear for every face and tone about him...
Rudyard Kipling 「"Captains Courageous"」
... His face waspartly averted, but his keen gray eyes never left those of Taug, and ashe came, his growls increased in depth and volume...
Edgar Rice Burroughs 「Jungle Tales of Tarzan」
... Keen eyesinspected the cage and counted the number of warriors...
Edgar Rice Burroughs 「Jungle Tales of Tarzan」
...Casting aside his loin cloth and weapons Tarzan entered the little poolbeneath the tree and after a moment emerged, greatly refreshed andfilled with a keen desire to breakfast...
Edgar Rice Burroughs 「Tarzan the Terrible」
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