retiring in WordNet English dictionary

1. of a person who has held and relinquished a position or office
   "a retiring member of the board"
   past  preceding  retiring 
   
2. reluctant to draw attention to yourself
   reticent  self-effacing  retiring 
   
3. not arrogant or presuming
   "unassuming to a fault, skeptical about the value of his work"; "a shy retiring girl"
   retiring  unassuming