Wallflower
wall-flow-er
[wawl-flou-er]
1. A
person who because of shyness, unpopularity, or lack of a
partner, remains to the side at a party or dance.
2. Any person who remains on or has been forced to the sidelines
of
any activity.
"He's a wallflower... you see things, you keep quiet
about them and
you understand"