I understand what you are trying to do. You chose the wrong tool to do it.
The Anti-spam Bad Words feature will block a request if any request parameter contains a forbidden word. That part you understand. What you didn't fully understand is that what you see in the URL and what Joomla ends up with as the request parameter is not necessarily the same thing because Joomla parses SEF URLs into request parameters. Bad Words will act on the parsed request parameters, not the SEF URL path, which do not contain the word you are trying to block.
What you are trying to do is best handled with custom .htaccess
code. Add the following to your .htaccess Maker "Custom .htaccess rules at the top of the file":
RewriteCond %{REQUEST_URI} /(evenementenperdag|evenementenperweek|evenementenperjaar)/ [NC]
RewriteRule ^ - [F,L]
Nicholas K. Dionysopoulos
Lead Developer and Director
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