Wiktionary
frumpily
adv. In a frumpy manner.
WordNet
frumpily
adv. in a dowdy unfashionable manner; "she dresses dowdily" [syn: dowdily, frumpishly]
Usage examples of "frumpily".
Rosalind, in her best linen skirt and jacket, feel frumpily overdressed.
When I am frumpily proper in serge and wool, she decided, I will enjoy my silk all the more.