retiring(a)
adj. moving toward a position farther from the front"retiring fogs revealed the rocky coastline"
同义词：receding
not arrogant or presuming"a shy retiring girl"
同义词：unassuming
of a person who has held and relinquished a position or office"a retiring member of the board"
同义词：past(a)preceding(a)
reluctant to draw attention to yourself 同义词：reticentself-effacing