_adj. _used in sense 'bad' of food etc., putrid. Tolkien seems to have rejected the root SAWA, noting: "No. THAW-, cruel. saura, cruel. Gorthaur-."
Sindarin
saur
adjective. bad (of food), putrid
saur
adjective. used in sense 'bad' of food etc
huar
noun. hound, wild dog, wild dog
An adjective meaning “bad (of food), putrid” in Definitive Linguistic Notes (DLN) from 1959 based on the root √SAWA “disgusting, foul, vile” that was the basis of the (Quenya) name Sauron (PE17/183). In a marginal note Tolkien said “No. THAW-, cruel. Saura, cruel”, apparently rejecting this etymology, but then he wrote an “X” next to the marginal note (PE17/184).
Conceptual Development: The Etymologies of the 1930s had N. thaw “corrupt, rotten” under the root ᴹ√THUS, also connected to the name Sauron (Ety/THUS).
Neo-Sindarin: For purpose of Neo-Sindarin, I think saur “putrid” and thaw “corrupt” can coexist.