Dictionary definition · keen
noun
- a funeral lament sung with loud wailing
verb
- express grief verbally"we lamented the death of the child"
adjective
- having or demonstrating ability to recognize or draw fine distinctions"an acute observer of politics and politicians"
- intense or sharp"suffered exquisite pain"
- excellent"he did a bully job"
- painful as if caused by a sharp instrument"a cutting wind"
- having a sharp cutting edge or point"a keen blade"
Source: Open English WordNet (CC BY 4.0).