Quote Originally Posted by Ramil
Is there any semantic difference between nothing and not anything, i.e.

I'll tell you nothing vs. I won't tell you anything
I know nothing vs. I don't know anything
The latter variants are much more common and more correct in normal speech:

"I won't tell you anything" is what you should be saying. "I'll tell you nothing" is more emphatic and should only be used in certain contexts.