...“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」
...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」
...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」
...a cruel look, that would have made her shudder, gleamedin Chauvelin’s keen, pale eyes...
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」
...Suddenly, those same keen instincts within her made her pause in her mad haste,and cower still further within the shadow of the hedge...
Baroness Orczy 「The Scarlet Pimpernel」
...His keen sapphire eyes considered her steadily a moment from under his level black brows...
Rafael Sabatini 「Captain Blood」
...Andre-Louis continued to laugh, quite silently, as he sometimes did when the humour of a jest was peculiarly keen...
Rafael Sabatini 「Scaramouche」
...I was keen about the last, and I made several trips myself over thelines with Archie Roylance, who had got his heart’s desire and by goodluck belonged to the squadron just behind me...
John Buchan 「Mr. Standfast」
... “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」
... In this Harvey excelled Dan, for he had inherited a head for figures, and the notion of stealing information from one glimpse of the sullen Bank sun appealed to all his keen wits...
Rudyard Kipling 「"Captains Courageous"」
...He found pleasure in watching the ungainly antics of Duro, thehippopotamus, and keen sport in tormenting the sluggish crocodile,Gimla, as he basked in the sun...
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」
...The pithecanthropus ate in silence, cutting small strips from thedeer's loin with his keen knife...
Edgar Rice Burroughs 「Tarzan the Terrible」
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