The word "keen" is an adjective. Use it to describe a person or an animal with a strong ability to do something:
- Eagles have a keen sense of sight.
- Dogs have a keen sense of smell.
- Albert Einstein had a keen mind. He was very smart.
- A priest should have a keen understanding of the human spirit.
- Mary Ann has a keen attraction to men who like to live life on the edge.*
Sometimes the word "keen" is used with "not" when a person isn't happy with a situation:
- Ifrah isn't very keen about going to school.
- Bill is not keen on delaying his retirement.
- No one is keen about having to pay more in taxes.
*live life on the edge: do things that are adventurous, risky, or dangerous.
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