Compounds of 多忙

• 多忙
  (adj-na,n) busy
  pressure of work
  (P)
• 多忙中
  (n) being very busy
  being busy at work
• ご多忙中
  (exp) in the midst of your work (often used as a formal phrase in business letters, etc.)
• 御多忙中
  (exp) in the midst of your work (often used as a formal phrase in business letters, etc.)