Keen (adjective)

1. Having or showing a strong and eager interest or desire.
2. Sharp or acute in feeling or perception.

Origin:

Old english cēne "bold, brave, fierce", of germanic origin; related to dutch and german kein "bold, brave, strong".

Examples:

1. She was keen to learn all she could about the new software.
2. He was very keen on getting the best grade possible in the class.
3. She has a keen eye for detail and can spot errors easily.
4. The detective had a keen sense of intuition and always solved the case.
5. She was keen to start the new job and was eager to make a good impression.