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keen
WIKTIONARY
keen
Adjective
  • showing a quick and ardent willingness or responsiveness, enthusiastic, eager; interested, intense.
  • vehement; fierce
  • sharp; having a fine edge or point.
  • acute of mind; sharp; penetrating; having or expressing mental acuteness.
  • bitter; piercing; acrimonious;
  • piercing; penetrating; cutting; sharp; -- applied to cold, wind, etc.
  • enthusiastic. Britain, often with "to" + infinitive or with a prepositional phrase
  • marvelous. US, informal, dated
  • extremely low as to be competitive. Britain
  • brave, courageous; bold, audacious. obsolete
Verb
  • To sharpen; to make cold. transitive, rare
Noun
  • A prolonged wail for a deceased person.
Verb
  • To utter a keen. intransitive
  • To utter with a loud wailing voice or wordless cry. transitive
  • To mourn. transitive