KEEN is validvalid

enthusiastic [adj KEENER, KEENEST] : KEENLY [adv], KEENNESS [n] / to wail loudly over the dead [v KEENED, KEENING, KEENS] : KEENER [n]

3,081 of 196,601 in NWL2023·also valid in CSW24

to wail loudly over the dead [v -ED, -ING, -S] / enthusiastic [adj KEENER, KEENEST, KEENLY]