Complex
Intricate, Complicated
noun, な adjective
If you think someone is trying to annoy you at random, just pay attention and you'll see that they have a complex annoying pattern they're using on you. Once you figure that out, it won't annoy you as much and you'll win!
はんざつ
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
煩雑な手続きに苛々します。
I’m irritated by complex formalities.