sad
adj.— «For Cathy Riddle, another Appalachian Fair champion who uses White Lily for everything from green tomato bread to “sad” dumplings (the kind with a chewy center), the selling point is consistent good results.» —“Biscuit Bakers’ Treasured Mill Moves North” by Shaila Dewan in Knoxville, Tennessee New York Times June 18, 2008. (source: Double-Tongued Dictionary)
Sad is a very old word that means heavy – “Sad Iron” is a heavy iron.