chętny pełen entuzjazmu v angličtině:

David has a keen interest in aesthetics — the qualities that make a painting, sculpture, musical composition, or poem pleasing to the eye, ear, or mind.

keen on something

A fence between makes love more keen.

Competition is very keen in the car industry.

Boeing, which builds more than half the world's commercial airliners, is understandably keen to draw attention to what can go wrong besides planes.

Japanese parents are not keen to talk about their own children.

bank was keen to build long term customer thrust.

They were very keen to start work as soon as possible.

She always look for extra work to do- she's very keen.

a. The butcher’s keen knife cut through the meat.

As a keen cyclist I am especially pleased by the provisions for carrying bicycles on the train.

They were very keen to start work as soon as possible.; Joan wanted to go to a movie but I wasn't keen (= I didn't want to go).; She's a keen tennis player.; She's keen on (playing) tennis.

meets a unique set of obstacles, but Campbell’s keen insight was that the outline of these stories is

He has become keen on Italian food since visiting Rome.

Hounds hunt by their keen scent.