An Etymological Dictionary of the German Language/flink

by Friedrich Kluge

flink, adj., ‘brisk, nimble, lively,’ simply ModHG. from LG. and Du. flink, ‘brisk, agile, nimble’; akin to earlier ModHG. flinken, ‘to glitter, shine’; comp. Gr. ἀργός, ‘gleaming, quick.’