The cause of the problem was not 'immediately' clear. [=is was not known right away]
They live in the house 'immediately' [='directly'] behind this one.
We need to leave 'immediately'. [='at once', 'right away']
(..) running to the front door. Heard the upstairs door open, the footsteps start down. He said he got to his own door in, at most, seconds. If the killer ran immediately... - Maybe he didn't. - The old man said he did. You oughta be at that hair-splitters' convention. Why don't you stop (..)1957 12 Angry Men