keen

The light showed a pale, square-jawed face with keen eyes, and a little white scar near his right eyebrow.

To the society bud comes but one début; it stands alone sweet in her memory when her hair has whitened; but to Chandler each ten weeks brought a joy as keen, as thrilling, as new as the first had been.

Something of his birthplace seemed to cling to the man, and I never looked at his pale, keen face or the poise of his head without associating him with grey archways and mullioned windows and all the venerable wreckage of a feudal keep.

Once or twice we drifted into talk, and I can remember that more than once he expressed a keen interest in my methods of observation and inference.