I'm not too busy to eat dinner
I'm not too busy not to eat dinner
Typically, you would need a double negative ("I'm not busy enough to not realized I skipped dinner," in that you weren't sufficiently busy to not know you skipped dinner; or "I'm not so sad to not go out to see my friends"), right?
Would negation + "too" + adjective require a double negative because if you negate one part, you would you need to negate the second part? Or would it be wrong to have the double negative? Is it wrong in general!?!
I'm too busy to eat dinner (i.e. due to a lack of time, I cannot eat dinner)
Would the opposite be: I'm not too busy to eat dinner -or- I'm not too busy to not eat dinner