All words that shouldn't be used (or MOST, rather, so don't try getting 'creative') are censored.
Stuff like hell, damn, shit, bitch, etc. are fine. Just use it in decent ways and refrain from using them as insults outside of Rants.
Now, if someone is going around typing "**** this," "**** you," you're a ****ing ******," etc., then no, you're not safe. Allowing the censorship to censor words is okay as long as you're not using them for the very reasons they are censored.
For instance, if you make a mistake and type "****!" (four letter f word, right), that would be fine. But if someone corrected you and you typed "**** you," that wouldn't be fine.