A girl or woman regarded as dull, plain, or unfashionable.
A person regarded as colorless and primly sedate.
[Possibly short for Middle English frumple, wrinkle, from Middle Dutch verrompelen, to wrinkle : ver-, completely; see per1 in Indo-European roots + rompelen, to wrinkle.] frump'i·ly adv., frump'i·ness n., frump'y adj.