Urgent, Emergency, Steep
adverb, な adjective
This takes its meaning from the sudden part of the kanji, meaning it's sudden, urgent, or an emergency!
This has the same reading as the kanji you learned, meaning you know the reading!
It was such sudden news that she was surprised.
I took an urgent assignment, so I have to pick my kid up later than usual today.
Sorry for the sudden request. We had to take an urgent order from the customer we cannot refuse.