What is piercing; penetrating; cutting; sharp; -- applied to cold, wind, etc, ; as, a keen wind; the cold is very keen. Breasts the keen air, and carols as he goes. Goldsmith called?

keen — Piercing; penetrating; cutting; sharp; -- applied to cold, wind, etc, ; as, a keen wind; the cold is very keen. Breasts the keen air, and carols as he goes. Goldsmith. (Webster's 1913.)

Sources