For describing something worn and in poor condition:
* Dilapidated
* Run-down
* Faded
* Battered
* Tattered
* Threadbare
* Worn-out
* Ragged
* Second-hand
* Used
For describing something lacking in quality or style:
* Cheap
* Tacky
* Gaudy
* Unfashionable
* Out-of-date
* Unpolished
* Unrefined
For describing someone's appearance or behavior:
* Unkempt
* Untidy
* Slovenly
* Dishevelled
* Scruffy
* Dowdy
* Unpresentable
The best synonym to use will depend on the specific meaning you want to convey.