Keen

Chamber's Twientieth Century Dictionary · 1908 · p. 57

kēn, adj. eager: sharp, having a fine edge: piercing: acute of mind: penetrating: intense.— adv. Keen′ly .— n. Keen′ne . [A.S. céne ; Ger. kühn , bold; Ice. kænn , wise. Cog. with ken and can .]