Early Noldorin
tunneb
adjective. full of holes, riddles
tundeb
adjective. full of holes, riddles
tunnen
adjective. full of holes, riddles
There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.
Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.
An adjective form of ᴱN. tonn “a bored hole, perforation”, with variants tunneb, tundeb, tunnen and having the glosses “full of holes, riddles” (PE13/165). I suspected the gloss “riddles” is a slip, and should have been “riddled” instead.