- keenkeen1 [kēn]adj.[ME kene < OE cene, wise, learned, akin to Ger kühn, bold < IE base * ĝen-, to KNOW: the principal senses spring from the basic notion “capable”]1. having a sharp edge or point; that can cut well [a keen knife, a keen edge]2. sharp or cutting in force; piercing [a keen appetite, a keen wind]3. sharp and quick in seeing, hearing, thinking, etc.; acute [keen eyes, a keen intelligence]4. sharp-witted; mentally acute; shrewd5. eager; enthusiastic; much interested: often with about, on, etc.6. strongly felt or perceived; intense; strong [keen desire, a keen scent ]☆ 7. Slang good, fine, etc.: a generalized term of approvalSYN.- EAGER1, SHARPkeenlyadv.keennessn.keen2 [kēn]n.[Ir caoine < caoinim, I wail]Irish a wailing for the dead; dirgevi.1. Irish to lament or wail for the dead2. to make a wailing, shrill, or mournful sound suggestive of a keenvt.to utter in a wailing toneSYN.- CRY
English World dictionary. V. Neufeldt. 2014.