Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!

Gnomish

haug

adjective. low

A word appearing as G. haug “low” in the Gnomish Lexicon of the 1910s based on G. haw- “rest” that was also the basis for G. haus “bed” (GL/48).

Neo-Sindarin: Since ᴹ√KHAW “rest” survived in Tolkien’s later writings with derivatives like [N.] haust “bed”, I think ᴺS. haug “low” can be retained for purposes of Neo-Sindarin.