To uninstall aspell-pt-pt just follow these instructions.
Are you having problems? You can always add aspell-pt-ptagain by following the instructions at this link.
This will remove just the aspell-pt-pt package itself.
This will remove the aspell-pt-pt package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for aspell-pt-pt then this will work.