Busy
い adjective
This is a single kanji with しい on the end, meaning it's an adjective. What's the adjective form of busy? It's also busy.
You're busy because you have to take care of your friend's ice ogres (いそが) this weekend. You don't know why you agreed to this, you were busy enough, but now you'll never get anything done running around taking care of these little ice ogres.
最近、とても忙しいんです。
I've been very busy lately.
忙しすぎて、頭がクラクラしています。
I'm so busy that my head is spinning.
今日は忙しくて、ランチを食べる時間もありませんでした。
Today was so busy that I didn't even have time for lunch.