"wallflower" in the noun sense
1. wallflower
any of numerous plants of the genus Erysimum having fragrant yellow or orange or brownish flowers
2. wallflower, Cheiranthus cheiri, Erysimum cheiri
perennial of southern Europe having clusters of fragrant flowers of all colors especially yellow and orange often naturalized on old walls or cliffs sometimes placed in genus Erysimum
3. wallflower
remains on sidelines at social event
Source: WordNet® (An amazing lexical database of English)
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