AddForce to opposite direction

Hello how can i addforce to the opposite direction after using this: `rigidbody_.AddForce(direction.normalized * force * Time.deltaTime, ForceMode.Force);` I tried `rigidbody_.AddForce(direction.normalized * -1 *force * Time.deltaTime, ForceMode.Force);` But it didn't work Thanks. P.S I tried also to do `rigidbody_.AddForce(direction.normalized * -2 * force * Time.deltaTime, ForceMode.Force);` and it works. But I want to addforce with the same force.