Origin: Latin suffix -ous
Frivolous has 2 different meanings across 1 category:
not serious in content or attitude or behavior
"a frivolous novel"
"a frivolous remark"
"a frivolous young woman"
Silly, especially at an inappropriate time or in an inappropriate manner.
"The committee rejected his frivolous proposal to build a giant slide on the construction site because it was completely out of place during the crisis."