Here are some synonyms for discarded:
* Abandoned
* Rejected
* Disposed of
* Cast off
* Junked
* Scrap
Here are some examples of how "discarded" can be used in a sentence:
* The old furniture was discarded and replaced with new pieces.
* She found a discarded wallet on the street.
* The company discarded the outdated software.
* The discarded newspapers were piled up in the corner.