1. finely sharpened, as an edge; so shaped as to cut or pierce substances readily: a keen razor.
2. sharp, piercing, or biting: a keen wind; keen satire.
3. characterized by strength and distinctness of perception; extremely sensitive or responsive: keen eyes; keen ears.
4. having or showing great mental penetration or acumen: keen reasoning; a keen mind.
5. animated by or showing strong feeling or desire: keen competition.
6. intense, as feeling
"people can be keen on things."
"people can be keen on people."
"people can be keen on ideas."
"places can be keen on things."
"people can be keen for people."
This list can help you learn new vocabulary more quickly and be able explore other words more easily.