いきなり
いきなり · ikinari · JLPT N2 · adverb
all of a sudden
⚡ 行き + なり = going just as you are: straight in, no warm-up
いきなり is usually written 行きなり: 行き (going) + なり (just as it is). It means acting without stopping to prepare, so something happens abruptly and out of nowhere. いきなり雨が降った means it suddenly started raining.