Silly, especially at an inappropriate time or in an inappropriate manner. (adjective)
Of little weight or importance; not worth notice; slight. (adjective)
Examples of word frivolous
ANDERSON: Well, as I pointed out earlier, you know, most meals are eaten at home and these lawsuits really do give the term frivolous a bad name.
In the months leading up to her July resignation as Alaska governor, her legal bills had mounted to more than $500,000, fueled mostly by what she called frivolous ethics complaints.
Now recall, Wolf, that when Palin announced that she's stepping down, she cited, in part, the endless ethics complaints against her, which she called frivolous and she said that the legal bills were more than $500,000.
Palin has said one of the reasons she's stepping down is because of what she called frivolous ethics complaints by political operatives descending on Alaska.
Some of his other pet issues including what he calls frivolous lawsuits.