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']
(..) Let me help you down there. Hell, no! I did not leave the Southside for this! Oh, crap! My hair! All junior girls report to the gymnasium immediately! Immediately! Have you ever walked up to people and realized they were just talking about you? Have you ever had it happen times in a row? (..)2004 Mean Girls
(..) when it's gonna rain. Really? That's amazing. Well, they can tell when it's raining. I have to admit, I was mildly horrified when Aaron didn't immediately ask me to be his girlfriend. I mean, I know he was sad, but how much time did he need? Regina had moved on. Do you guys need anything? (..)2004 Mean Girls