frumpy
Concise Oxford English Dictionary © 2008 Oxford University Press:
frump/frʌmp/
▶noun an unattractive woman who wears dowdy old-fashioned clothes.
– derivatives
frumpily adverb,
frumpiness noun,
frumpish adjective,
frumpishly adverb,
frumpy adjective (frumpier, frumpiest).
frumpily adverb,
frumpiness noun,
frumpish adjective,
frumpishly adverb,
frumpy adjective (frumpier, frumpiest).
– origin C16 (orig. in sense ‘mocking speech’, later ‘bad-tempered woman’): prob. a contr. of ME frumple ‘wrinkle’, from MDu. verrompelen.
'frumpy' also found in these Oxford entries:

