Definition of frump noun from the Oxford Advanced Learner's Dictionary

 

frump

 noun
noun
BrE BrE//frʌmp//
 
; NAmE NAmE//frʌmp//
 
(disapproving)
 
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a woman who wears clothes that are not fashionable Word Origin mid 16th cent.: probably a contraction of late Middle English frumple ‘wrinkle’, from Middle Dutch verrompelen. The word originally denoted a mocking speech or action; later (in the plural) ill humour, the sulks; hence a bad-tempered, (later) dowdy woman (early 19th cent.).
See the Oxford Advanced American Dictionary entry: frump