What is the meaning of Frump?

A frumpy person, somebody who is unattractive, drab or dowdy.

Unattractive, dowdy clothes.

A bad-tempered person.

A flout or snub.

To insult; to flout; to mock; to snub.

To assume a countenance or demeanor indicating irritation, ill-humor, or disapproval.

A sour ill-humored person.

to chafe, scold

Source: wiktionary.org