• a funeral lament sung with loud wailing
• express grief verbally; "we lamented the death of the child"
• having a sharp cutting edge or point; "a Keen blade"
• as physically painful as if caused by a sharp instrument; "a cutting wind"; "Keen winds"; "knifelike cold"; "piercing knifelike pains"; "piercing cold"; "piercing criticism"; "a stabbing pain"; "lancinating pain"
• very good; "he did a bully job"; "a neat sports car"; "had a great time at the party"; "you look simply smashing"
• very penetrating and clear and sharp in operation; "an incisive mind"; "a Keen intelligence"; "of sharp and active intellect"
• intense or sharp; "suffered exquisite pain"; "felt exquisite pleasure"
• having or demonstrating ability to recognize or draw fine distinctions; "an acute observer of politics and politicians"; "incisive comments"; "icy knifelike reasoning"; "as sharp and incisive as the stroke of a fang"; "penetrating insight"; "frequent pene

'Keen' in other languages