noun
wallflower
Refers to a person who remains on the sidelines at a social event, often due to shyness. Also used for the plant Erysimum.
パーティーで彼女はウォールフラワーになっていた。
She was a wallflower at the party.
ウォールフラワーは春に黄色い花を咲かせる。
Wallflowers bloom yellow flowers in spring.
Borrowed from English 'wallflower'.