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']
(..) Then we'll have to operate without it. No, no! Leave me alone! You can't do it. I won't let you do it to me! Tell Dr. Wilson to take this leg off immediately. It's gangrene. No, no! Don't! I haven't seen my family in three days. I'm going home for half an hour. Orderly! Give me a lift. (..)1939 Gone with the Wind