2: Depressing, scary, or triviliazing something that others would find depressing or scary.
3: Another way of saying evil
4: Having to do with individuality and isolation. Considered good in some circles, with it's opposite, light having to do with conformity and lack of integrity.
Dead baby jokes? I didn't realize you had such a dark sense of humor.
Watch out, he has dark intentions.
So you're dark, I was getting tired of dealing with all those sheep.
Moron McMoronington: "The Dark Knight is the darkest of the two."
Grandad: "The jewish prisoners at Auschwitz saw some very dark times..."
Tom "Yes indeed."