Linn: Just a gentle reminder that in the United States, the S-word is not socially acceptable in any form. If you come to the States to visit or study, it would be a good idea not to use it, The C-word is not so taboo, but it is not very elegant, either.

Like most swear words, they can be both nouns or adjectives. If you want to, you can say 'crappy' or 'shitty'.