wallflower

IPA: wˈɔɫfɫaʊɝ

Any of several short-lived herbs or shrubs of the Erysimum genus with bright yellow to red flowers.
Gastrolobium grandiflorum, a poisonous bushy shrub, endemic to Australia.
A person who does not dance at a party, due to shyness or unpopularity; by extension, anyone who is left on the sidelines while an activity takes place.
(informal) Any person who is socially awkward, shy, or reserved.

(intransitive) To stand shyly apart from a dance, waiting to be asked to join in.

Examples of "wallflower" in Sentences

I was what you would call a wallflower, she said with a smile.
They are usually perceived as the "wallflower," and often do not get deeply engaged in life.
The man in Washington who can not dance is a "wallflower" -- that is, he never leaves the wall.
Do they generally fall under the "wallflower" category, suffering from lack of self-confidence?
They were the type of dudes who would probably make Iggy seem like a bit of a wallflower, which is funny because that's so far removed from his reputation.
The album is almost always more intricate than its modest tone suggests, with the best tracks recalling wallflower tunesmiths from the Zombies 'Colin Blunstone to the Softies.
FERGUSON: You self-sabotage, your self-esteem out of the window, you lose confidence, and in my particular case, you walk into the room backwards so that you know -- and try to be a wallflower, which is quite difficult when you've got the world's media watching you, and you permanently think this thing traveling behind you -- you don't know what it is, but you realize it's your own backside.