See here.

Initial request by Kiril kovachev:

Hello, if there isn't a feature like this somewhere already, I propose a per-user blacklist of sorts, which would allow users to select words which would be excluded when you choose one of the generator options to generate words. I'm currently going through a list of words in a Wiktionary category, and I'm confronted with a growing list of words that I can't deal with because they aren't suitable for pronunciation (e.g. particles that surround other arbitrary words), or they're just homophones of something I've already recorded, etc.