Keen
verb
To make cold, to sharpen.
adjective
Often with a prepositional phrase, or with to and an infinitive: showing a quick and ardent responsiveness or willingness; eager, enthusiastic, interested.
“I’m keen on computers.”
Fierce, intense, vehement.
“This boy has a keen appetite.”
Having a fine edge or point; sharp.
Synonyms: biting, cutting, piercing, acute, penetrating, shrewd, sharp, ardent