retiring (
http://definr.com/retiring)
adj 1: not blatant or overly aggressive in manner or appearance; "a
retiring disposition" [syn:
unassertive]
2: moving toward a position farther from the front; "the
receding glaciers of the last ice age"; "retiring fogs
revealed the rocky coastline" [syn:
receding]
3: not arrogant or presuming; "unassuming to a fault, skeptical
about the value of his work"; "a shy retiring girl" [syn:
unassuming]
4: of a person who has held and relinquished a position or
office; "a retiring member of the board" [syn:
past(a),
preceding(a),
retiring(a)]