The phrase "something insignificant" is correct and usable in written English.
You can use this phrase to refer to a lack of importance or worth of an object or event. For example: "The fact that I forgot her birthday seemed insignificant at the time, but the fallout from the mistake was immense."
Every other piece of industrial design is a pot or a dish or something insignificant.
Out of nowhere, in the midst of one of our agreed-upon dog walks, or while washing the dishes or whatever, often as I talked about something insignificant, Giulia would interrupt and say, "Mark, if someone kills themselves, do they still get a funeral?" Long pause on my part.
Penn was something rarer, an instinctive popular classicist, with a magical gift for visual rhythm, for making something insignificant — a pattern of cigarettes and ashes, each ash miraculously in its one best place — look as formally inevitable as an eighteenthcentury still-life.
"They just kept playing it down as something insignificant, whereas effectively I was running the risk of arthritis in later life by not having it fixed".
"We were discussing something insignificant," Kelly remembered.
Does it make sense for a millionaire athlete to be lashing out about something insignificant that happened in high school five years ago?
Mr. Brown took the bait, scolding reporters in his home state for pestering him about something so insignificant.
But when the mockery ends, the pieces I've read eventually grow indignant at the very idea that people care about something as insignificant as pleasure.
It's interesting for me to take something so insignificant and minor and affectless on its own and let it permeate in many different ways".
"I would never even make up in my wildest dreams and think I would have to go through a system like that for something so insignificant as doggy poop".
"Sir," he said to Mr. Shargel as he pointed emphatically at the defendant, "if you think I am sitting here to put Danny Pelosi in jail for the rest of his life for something as insignificant as you are suggesting, that is ridiculous".
