2 adj. thick, of single thing. Tolkien seems to consider that it is not a suitable Sindarin form.
Sindarin
delw
adjective. thick
le
thick
tûg
thick
tûg (lenited dûg, pl. tuig)
tûg
thick
(lenited dûg, pl. tuig)
Noldorin
tûg
adjective. thick, fat
Quenya
tiuca
thick, fat
tiuca adj.("k") "thick, fat" (TIW)
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!
Early Primitive Elvish
tiw̯i
root. thick
Early Quenya
tyúka
adjective. thick
adj. thick, of single thing. Tolkien seems to consider that it is not a suitable Sindarin form.