Noldorin 

uluithiad

adjective. unquenchable

An adjective for “unquenchable” appearing in Lord of the Rings drafts of the 1940s in the name Harthad Uluithiad “Hope Unquenchable” (SD/62). Patrick Wynne suggested it might be related to Q. luita- “flood, drench” and the root √LUY (VT48/31).