Frivolosity

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.

Source: wiktionary

Hence that frivolosity of conduct, which pervades all ranks of men, even where the intereſts of eternity are concerned.

Source: wiktionary

Attention to vain and frivolous objects, produces a vanity and frivolosity of taſte and diſpoſition, &c.

Source: wiktionary

Avoid four particular defects in converſation: firſt, frivoloſity or uſeleſſneſs, for Jeſus Chriſt declared, “we ſhall be accountable for every idle word.”

Source: wiktionary