0 the quality of being very interested and eager, or wanting something very much: --
1 an ability to understand things quickly : --
He thought she was frivolous and would not feel the keenness of this misfortune like other people.
Youthful passion is known for the keenness of its disappointments.
The creatures were noted for their keenness of scent and sight.
"Well, then," said Bob, whose keenness saw at once what was implied.
his understanding of the world problems, the depth of his questions, his grasp of the issues and the keenness of his mind