Keen

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Keen

(superl.) Sharp; having a fine edge or point; as, a keen razor, or a razor with a keen edge.
(superl.) Acute of mind; sharp; penetrating; having or expressing mental acuteness; as, a man of keen understanding; a keen look; keen features.
(superl.) Bitter; piercing; acrimonious; cutting; stinging; severe; as, keen satire or sarcasm.
(superl.) Piercing; penetrating; cutting; sharp; -- applied to cold, wind, etc, ; as, a keen wind; the cold is very keen.
(superl.) Eager; vehement; fierce; as, a keen appetite.
(v. t.) To sharpen; to make cold.
(n.) A prolonged wail for a deceased person. Cf. Coranach.
(v. i.) To wail as a keener does.