frivolosity noun2 •The quality of being frivolous.Let us hope, that no frivolosity of manners, no pride of wealth, of ancestry and arms, or difference of opinion, will hereafter lessen those reasonable enjoyments. — 1790 •Something frivolous.[…]whose wisdom lies more (if not in forgetting) yet at least in forgoing frivolosities, that are so Remote to the Souls Redemption, then to fight so fiercely and foolishly for them[…] — 1660 formsfrivolosities