“Then you still would have a chance to marry each other,” I said frivolously.
Oh, but we mustn't talk so frivolously when that poor man may be dying.
You can take it as seriously or as frivolously as you please.
She thought her too fashionably dressed, frivolously gay and vain.
I know that you have plenty of money, but that is no reason why you should waste it so frivolously.