* "She has a keen interest in photography, always experimenting with new techniques." (meaning: strong, enthusiastic)
* "The detective's keen eyes noticed a tiny scratch on the door, a clue others had missed." (meaning: sharp, perceptive)
* "The wind was keen and biting, making us hurry inside." (meaning: sharp, piercing)
* "He gave a keen nod of approval, indicating his agreement with the plan." (meaning: eager, enthusiastic)
* "The competition was keen, with all the contestants vying for the top prize." (meaning: intense, fierce)