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 

mista-

verb. to stray about

A verb in The Etymologies of the 1930s glossed “stray about” derived from the root ᴹ√MIS “go free, stray, wander” (Ety/MIS).

hiswa

adjective. grey, grey [of weather], *foggy, overcast; [ᴱQ.] dim, fading

This word is glossed “grey” in The Etymologies, but perhaps means “✱foggy, overcast”, since Sindarin cognate hethw means “foggy, obscure, vague” and related noun hiswë means “fog”. @@@