If you want a anonymous transaction just use a Bitcoin mixer/tumbler services or just use other alternative coin like Monero.
Even a HD Bitcoin wallet its easily to track by using a tool.
Hope that help you a lot.

There is no need of using mixers now as it is 2018 and there are quite a few reliable
available in the market. I myself have been using two of them and have created a list of those. Do check it out and share your feedback: