Describes matters, details, or differences that are so small or unimportant that they are not worth serious attention. Often used in formal or critical contexts to dismiss something as insignificant.
We shouldn't spend time on such a trivial issue.
両者の違いは瑣末な点に過ぎない。
The difference between the two is nothing more than a minor point.
瑣末 describes triviality itself (often as a na-adjective or noun of quality), while 些事 names an actual trivial matter or item.
trivialism
Standard kanji spelling; 瑣 is a non-jōyō character but this form is common in news and formal writing.
Alternative spelling using the more common 些 character; also widely seen.
A Sino-Japanese compound of 瑣 “small, petty” and 末 “minor details,” referring collectively to trifling matters. 些末 is a variant spelling.