A word for “flint-hearted” in Treebeard’s description of orcs, a combination of Q. sinca “flint” and Q. honda “hearted” (LotR/979; PE17/111).
Conceptual Development: In 1940s Lord of the Rings drafts, this word first appeared as ᴹQ. tingahondo (SD/68).
sincahonda adj. "flint-hearted" (LotR3:VI ch. 6). Hence noun #sinca "flint-[stone]"?