Meaning: Eager or enthusiastic
* "I'm keen to learn more about coding."
* "She was keen on the idea of a weekend trip to the mountains."
* "The students were keen to participate in the debate."
Meaning: Sharp or intense
* "The detective had a keen eye for detail."
* "She felt a keen sense of disappointment when she didn't get the job."
* "The air was filled with the keen scent of pine needles."
Meaning: Strong or powerful
* "The wind howled with a keen, piercing sound."
* "The competition was fierce, and the teams were keen to win."
* "The blade was keen and sharp, ready to cut through anything."
Let me know if you'd like more examples or want to explore other ways to use "keen" in a sentence.