a. (UN-1 7.)
1655. Earl Orrery, Parthen., II. v. 493. To speake any thing unserious.
1673. Flavel, Saint Indeed, 199. Frothy, vain and unserious persons.
1755. Wesley, Wks. (1872), II. 326. Any one who behaved in a light or unserious manner.
1860. Hawthorne, Fr. & It. Note-bks. (1871), II. 357. A plaything, a trifle, an unserious affair.
Hence Unseriousness.
1680. H. Dodwell, Two Lett. (1691), To Rdr. § 9. The lives and unseriousness of some of our conformable Clergy.