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']
(..) Krona was a tyrant with insatiable aggression, Sinestro. He vowed to destroy Oa, and we take that threat seriously. We suggest you charge your rings immediately... ...for the Central Battery will be removed as well. Let those who worship evil's might Beware my power, Green Lantern's light LANTERNS: (..)2011 Green Lantern: Emerald Knights