Characterized by a lack of seriousness or purpose; given to trifling or silly behavior. 'Frivolous' describes something or someone that is not worth serious attention because it is silly, trivial, or lacking in intellectual substance.
It often implies a lightheartedness that is inappropriate given the situation, or a concern with superficial matters rather than important ones.
A Frivolous person might engage in activities that are amusing but ultimately unimportant, while a Frivolous argument might be weak and easily dismissed.
IDLE FLIP
LIGHT SILLY
FLIGHTY TRIVIAL
SKITTISH TRIFLING
EMPTYHEADED SUPERFICIAL