General:
* Trivial: Something of little value or importance.
* Insignificant: Having little or no importance or effect.
* Negligible: So small or unimportant as to be disregarded.
* Meaningless: Lacking significance or purpose.
* Frivolous: Lacking seriousness or importance.
* Worthless: Having no value or importance.
More specific:
* Petty: Of little importance; trivial.
* Superficial: Concerned with appearances rather than with what is important.
* Irrelevant: Not connected to the matter at hand; unimportant.
* Unremarkable: Not worthy of notice or attention.
* Paltry: Very small or meager.
The best word for you will depend on the context of your sentence.