keen

• "All these men, who flew to do my bidding when my eye was clear and my sword keen, are beginning to make plans for their own advantage, thinking that I cannot detect their guile. —  The Path to Honour
• His face was the face one feels he has a right to expect of a newspaper man--keen, alert, humorous; on the look-out for opportunities. —  The Four Pools Mystery
• They were as well equipped with axes--keen, heavy weapons--as they were with rifles and ammunition, and these were as necessary. —  The Young Trailers A Story of Early Kentucky
• But between his fiery poll and his plebeian and upturned nose flashed a pair of eyes--keen, piercing, and steady--worthy of Caesar or of Napoleon. —  Deeds that Won the Empire Historic Battle Scenes
• His unaffected countenance seemed to say: "I wear it because it is useless to put off what no one else will wear, when presently I shall need nothing but a shroud Judge Custis looked at the meek old gentleman closely, sitting at his plate like a lay brother in some monastery or infirmary, indifferent to talk or news or affairs; and the remembrance of what he had been--keen, accumulative, with youthful passions long retained, and the man buoyant under the judge's guard--impressed the Virginian to say to himself What, then, is man! —  The Entailed Hat Or, Patty Cannon's Times

Roget's II: The New Thesaurus

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