The results, overall, are predictable â San Francisco is the most liberal, while Mesa, Arizona is most conservative â with a few surprises embedded in the list.
1 keenly In a keen manner; eagerly; sharply; with keenness or intensity; acutely.
Keen is used in this sense as a stand-in for sharp. See usage 1a at Merriam-Webster, for instance. The usage keen for sharp is fairly common: a keen edge, a keen blade, etc. share | improve this answer.