wallflower
n//ˈwɑlˌflaʊ.ɚ//gyllenlack, kårel, panelhöna, blyg viol, vägglus
Any of several short-lived herbs or shrubs of the Erysimum genus with bright yellow to red flowers.
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.