Then just say "kinda slow". Easy. If you want to use a charged word, it's on you to make your intention easily understood. If that's too much for you, then just use a safe and well-understood word.
Then just say "unspeedwise". Easy. If you use ungood words, it's on you to not lead others to thinkcrime. If that's too much for you, just use the safe and well-understood A vocabulary.