Hurried
Hasty, Busy, Hectic, Frantic
い adjective
This is a single kanji with an い all the way at the end, meaning you know it's probably an adjective. Confused is already an adjective and this word is a little different. Usually when you get confused it's because you were already hurried, busy, and things were hectic. So this adjective is what causes your confusion.
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You've learned this reading, so you should be able to read this already!
十二月はレストランにとって慌ただしい時期だ。
December is a hectic season for restaurants.
本当、カツオくんのお姉さんって慌ただしい性格ね。
Seriously, your older sister is such a frantic person, Katsuo-kun.
出発が慌ただしく、コーヒーも飲めなかった。
It was a hasty departure. I didn't even get to drink a cup of coffee.