Frivolity :: Frivolity (n.) The condition or quality of being frivolous; also, acts or habits of trifling; unbecoming levity of disposition..
Frivolous :: Frivolous (a.) Of little weight or importance; not worth notice; slight; as, a frivolous argument..
Frivolous :: Frivolous (a.) Given to trifling; marked with unbecoming levity; silly; interested especially in trifling matters.