Simple Question #006a: What Makes a Word "Cursed"?

I know there is a long list of "forbidden" words in today's world. In English alone there are dozens. Some of them are really fun to say, but what exactly is it about then that makes them less than acceptable to say in mixed company?

Would Jesus use some of these words? If not, then why? Methinks He might not avoid them just because he's supposed to. There must be an underlying reason beyond avoiding offense.

What do you think?