noun
frump
FRUMP/frʌmp/
A person whose appearance is dull and unfashionable.
I feel like a frump in this shapeless old sweater.

Etymology
Early uses described a cross, unstylish person; related words referred to mockery and bad temper. The family's origin remains uncertain.
In context
Yes, I'll go. I'm a frump.
More examples
- She refuses to look like a frump at the reunion.
- That oversized coat makes him look like a frump.
- They call us frumps because we prefer comfort to fashion.
Forms
frump · frumps
frumpy adjective — Dull and unfashionable in appearance.
Similar words
- slob
- Suggests dirtiness or untidiness rather than simply unfashionable clothing.