Brainless
A person that acts without any care of what'll be the consequences of what he's doing. Also a stupid, superficial, dull person.
Example:
1. Oh, damn! You act like you're brainless! Don't you think about what will happen if you do that?
2. That boy's brainless. I suggest you to not go out with him.
1. Oh, damn! You act like you're brainless! Don't you think about what will happen if you do that?
2. That boy's brainless. I suggest you to not go out with him.