When I check my texts with aspell (with the British dictionary), the word "froward" is accepted (because it is a real English word). However I never use it, so in my texts "froward" is always a misspelling of "forward". Therefore I want aspell to reject "froward".
How can I remove a word from Aspell's standard dictionary? Is there a way to create a "blacklist" of words? There is no way to mark it in .aspell.en.pws, because the personal dictionary only contains a "whitelist".
You can't.
Aspell does not support it.
Submit an issue or a pull request on the official repo if you care.