He was worried that tiny deviations in tuning would jar his keen perception of pitch.

We both began to wonder about our powers of observation - was journalism really the right field for guys with such keen perception?

There was much that was odd about them, even to his keen but unsophisticated perceptions.

Therefore it is that they have an especially keen perception of the alien movements.

Given his profession, I am never surprised by his keen perception of others.

What had happened to his keen perception about people?

But then, Captain Karapleedeez was famous for her keen perceptions.

Really, he is a man of keen perception.

The lazy man has an infinitely keener perception of metaphysical reality than the active one.

The iron will and keen perception he had noted in the open meetings was even more prevalent when encountered head-on.