His eyes had already the keenness of a falcon, and so straight and strong he grew that the heart of King Alf was filled with joy.
Of his keenness of observation take the following illustration.
He opened up his heart to Martin, showed with what keenness and with what enormous planning he had made the store.
A slender toque brought out the keenness in the oval of her face.
Page 175: "observavation" changed to "observation" (In old bears curiosity is accompanied with a keenness of observation).
She set too high value upon her acumen, upon the keenness of her instincts.
But afterwards he continued to look at me in silence with a keenness and curiosity I did not understand.
But he did not; nor did Bale, though the servant's face betrayed the keenness of his anxiety.
His portrait exhibits a face in which quickness and keenness of intellect are strongly marked.
The Jew had his racial respect for keenness and clean-cut ability.
c.1200, from Old English cene "bold brave," later "clever, wise," from Proto-Germanic *kan- "be able to" (see can). Original prehistoric senses seem to have been both "brave" and "skilled;" cognate with Old Norse kænn "skillful, wise," Middle Dutch coene "bold," Dutch koen, Old High German kuon "pugnacious, strong," German kühn "bold, daring." Sense of "eager" is from mid-14c. The meaning "sharp" is peculiar to English: of blades and edges early 13c., of sounds c.1400, of eyesight c.1720. A popular word of approval in teenager and student slang from c.1900.
"lament," 1811, from Irish caoinim "I weep, wail, lament," from Old Irish coinim "I wail." Related: Keened; keening. As a noun from 1830.