As you know the meanings of frivolous include:
Behaving in a silly and thoughtless way when you should be serious.
An activity or object which is silly or not important rather than useful or serious
Upon reading far from frivolous in the following text, I am wondering if it means something different.
However, some new research suggests that when women talk to women, their conversations are far from frivolous, and cover many more topics (up to 40 subjects) than when men talk to other men.