noun, na-adjective, noun which may take the genitive case particle 'no'
very busy; busyness
Describes a state of being extremely busy, often with many tasks or engagements. Used as a noun, na-adjective, or no-adjective.
彼は多忙な毎日を送っている。
He leads a very busy daily life.
多忙のため、返事が遅
I am late in replying due to being very busy.