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!

Qenya 

arka

adjective. narrow

An adjective for “narrow” in The Etymologies of the 1930s derived from ᴹ✶akrā under the root ᴹ√AK “narrow, confined” (Ety/AK).