adjective
They are keen fans of TV soap operas. I was keen to go swimming
This axe is very keen, so be careful. With his keen wit, the playwright answered his severest critics. His play is a keen satire on the government
She felt keen resentment at the way she had been treated
He has a keen recollection of seeing the suspect on the bus
The bloodhound has an extremely keen sense of smell
Philip has a keen understanding of what is required of him
Alan is almost as keen on Mary as on his stamp collection
verb
Finnegan's widow still keens over him
noun
The keens could be heard throughout the neighbourhood
US