keen

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.

Acute of mind, having or expressing mental acuteness; penetrating, sharp.

Acrimonious, bitter, piercing.

"keen satire or sarcasm"

Cutting, penetrating, piercing, sharp.

"a keen wind"

Of prices, extremely low as to be competitive.

Marvelous.

"I just got this peachy keen new dress."

Brave, courageous; audacious, bold.

To make cold, to sharpen.

A prolonged wail for a deceased person.

To utter a keen.

To utter with a loud wailing voice or wordless cry.

To mourn.