Wiktionary
unridged
a. Not ridged; without ridges.
Usage examples of "unridged".
Their smooth unridged brows, tranquil eyes, evenly curving jaws, and long cheek-molding hair—here silvery yellow, there black shot with darkest brown (in turn gold-shotten, or were those golden wires braided in?
Jhen the brows, unridged, even, straight-lined with patient endurance.