Of his keenness of observation take the following illustration.
A slender toque brought out the keenness in the oval of her face.
She set too high value upon her acumen, upon the keenness of her instincts.
Still it was hers, awarded to her because of keenness of brain and faithfulness of action.
Powers of mind that had been dulled were restored to animation and keenness.
But he did not; nor did Bale, though the servant's face betrayed the keenness of his anxiety.
On these he expatiated with all the keenness of argument, joined to logical reasoning.
I admit nothing, my boy, save that the keenness of the chase is gone.
There was fascination in his glance, and yet it had the dagger's keenness.
The wisdom and keenness of observation they show are amazing.