Blacklisting a word means removing a word from showing up as a typing suggestions. You can still type it but the prediction engine won't provide it as a typing suggestiong.
- Go into Text correction Settings and select Blacklist word setting
- Add the word you want to blacklist (remove from main dictionaries). For example, if you often mis-type hello as jello, blacklist the word jello.
- Alternatively, you can enable the Long press to blacklist setting.
- Then you can press and hold a word on the suggestion bar to get an option to blacklist the word.