An Etymological Dictionary of the German Language/fertig

by Friedrich Kluge

fertig, adj., ‘ready, complete, dexterous,’ from MidHG. vęrtec, vęrtic (from vart, ‘journey’), adj., ‘able to walk, walking, in motion, ready, fit,’ OHG. fartîg; Du. vaardig, ‘ready.’ The adj., like bereit and rüstig, probably meant orig. ‘equipped for a military expedition.’