Noun and な adjective
たぼう
最近多忙でつかれていて、よく舌がもつれるんです。
I've been tired because of how busy I've been lately, and it's been making me tongue tied.
多忙な生活を送っています。
I lead a busy life.
ご多忙な所申し訳無いんですが、少しの間代わりに列の順番を取っておいてもらえませんか？
I know how busy you are, and I feel terrible asking this, but would you mind saving my place in line for a few minutes?
If you've had many busy days, then you're even more busy than you thought!
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.