Compounds of 匆匆

• 匆匆
  (adj-na,adj-t,adv-to,n) (1) (arch) busy
  hurried
  rushed
  (n,adj-na) (2) Yours Sincerely
  Yours in haste
• 烏兎匆匆
  (exp) days and nights passing by quickly
  months and years flying by
  Time flies