In a manner that is of little importance or significance.
The problem was solved trivially, requiring only a basic understanding of the concept.
In a way that is obvious or self-evident.
The answer to the question was trivially true, leaving no room for doubt.
In mathematics, logic, or computer science, in a manner that can be proved or established with minimal effort, often by direct reference to definitions.
Since every empty set is a subset of any set, the statement holds trivially.