keen
adjective
°(obsolete) brave, courageous; bold, audacious.
°Showing a quick and ardent willingness or responsiveness, enthusiastic, eager; interested, intense.
verb
°To sharpen; to make cold.
°(Ireland) To utter a keen.
noun
°A prolonged wail for a deceased person.
synonyms: prompt, eager, ardent, sharp more» , acute, cutting, penetrating, biting, severe, sarcastic, satirical, piercing, shrewd