As a native English speaker there are words there that I've never seen and others were I would not know the original adjective. In wiktionary, you can click the

As a native English speaker there are words there that I've never seen and others were I would not know the original adjective. In wiktionary, you can click them see etymology, here https://en.wiktionary.org/wiki/-th#English https://en.wiktionary.org/wiki/-th#English For example, apparently "filth" comes from the equivalent of "foul".