Definition of wallflower
1a
: any of several Old World perennial herbs (genus Cheiranthus) of the mustard family
especially
: a hardy erect herb (C. cheiri) widely cultivated for its showy fragrant flowers
b
: any of a related genus (Erysimum) of herbs with showy flowers
2a
: a person who from shyness or unpopularity remains on the sidelines of a social activity (such as a dance)
b
: a shy or reserved person
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Merriam-Webster unabridged
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Time Traveler for wallflower
The first known use of wallflower was in 1577
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