keen

1. superl. Sharp; having a fine edge or point; as, a keen razor, or a razor with a keen edge. Source: opted

2. superl. Acute of mind; sharp; penetrating; having or expressing mental acuteness; as, a man of keen understanding; a keen look; keen features. Source: opted

3. superl. Bitter; piercing; acrimonious; cutting; stinging; severe; as, keen satire or sarcasm. Source: opted

4. superl. Piercing; penetrating; cutting; sharp; -- applied to cold, wind, etc, ; as, a keen wind; the cold is very keen. Source: opted

5. superl. Eager; vehement; fierce; as, a keen appetite. Source: opted

6. v. t. To sharpen; to make cold. Source: opted

7. n. A prolonged wail for a deceased person. Cf. Coranach. Source: opted

8. v. i. To wail as a keener does. Source: opted

9. adj. having or demonstrating ability to recognize or draw fine distinctions Source: wordnet

10. adj. intense or sharp Source: wordnet

11. adj. excellent Source: wordnet

12. adj. painful as if caused by a sharp instrument Source: wordnet

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