A girl or woman regarded as dull, plain, or unfashionable.
A person regarded as colorless and primly sedate.
A dowdy, unattractive woman.
(obsolete) To insult; to flout; to mock; to snub.
Origin of frump
Possibly short for Middle English frumple wrinkle from Middle Dutch verrompelen to wrinkle ver- completely per1 in Indo-European roots rompelen to wrinkle