Simple & Direct:
* The argument over the missing pen was a trivial matter.
* She dismissed his concerns as trivial.
* He found the task trivial and easily completed it.
Adding Context:
* Compared to the vastness of the universe, our problems seem trivial.
* He had a trivial role in the movie, only appearing in a few scenes.
* The news about the missing cat was trivial compared to the political upheaval in the country.
With Emphasis:
* This is an incredibly trivial issue that shouldn't be taking up our time.
* The book dealt with trivial matters like fashion and gossip.
* It's amazing how people get so worked up over such trivial things.
Remember: "Trivial" can be used to describe something that is insignificant, unimportant, or of little value. Choose the sentence that best suits the context you're writing in.