General:
* Rubbish: This is the most straightforward option.
* Trash: Similar to rubbish, but often used for discarded materials.
* Junk: This implies something that is not only worthless but also useless or broken.
* Garbage: Similar to trash, but often used for food waste.
* Tripe: This word implies something that is not only worthless but also nonsensical or poorly made.
* Crap: This is a more informal and vulgar term for rubbish.
* Nonsense: This emphasizes the lack of value due to being nonsensical or illogical.
More specific:
* Worthless: This emphasizes the lack of monetary or practical value.
* Useless: This highlights the lack of utility or functionality.
* Pointless: This emphasizes the lack of purpose or meaning.
* Futile: This emphasizes the lack of effectiveness or success.
* Insignificant: This emphasizes the lack of importance or impact.
* Frivolous: This emphasizes the lack of seriousness or substance.
* Ephemeral: This emphasizes the lack of lasting value.
The best word to use will depend on the context and the specific meaning you want to convey.