having or showing eagerness or enthusiasm

a keen gardener

John was keen to help

(of a sense) highly developed

I have keen eyesight

(of the edge or point of a blade) sharp

the keen blade went through the weeds

(of activity or feeling) intense

there could be keen competition to provide the service

excellent

I would soon fly to distant stars—how keen!

a person who wails or sings in grief for a dead person

a team of five keeners was hired to cry on the way to escort their father to the crematorium

a person who is extremely eager, zealous, or enthusiastic

for the real keeners, tickets can be purchased in advance