puerility

Noun

puerility (countable and uncountable, plural puerilities)

1. The state, quality, or condition of being childish or puerile.
   • This classification should have led to the discovery and study of remedies which act specifically upon the various textures and tissues of the body, such as the cellular, serous, mucous, parenchymatous, fibrous, gelatinous, &c., but it did not, except in the most imperfect manner—so imperfect, in...1863, John C. Peters, F[rederick] G. Snelling, “Section I. Of Medicine as a Science and as an Art; Its Objects and Its Extent.”, in Principles and Practice of Medicine, New York, N.Y.: William Radde...
2. That which is puerile or childish; especially, an expression which is insipid or silly.
   • You treat his opinions (though he never thrusts them on you) about "the Church," and his duty, and the souls of his parishioners, with civil indifference, as much ado about nothing; and his rubrical eccentricities as puerilities.1857, Charles Kingsley, “The Way to Win Them”, in Two Years Ago, volume I, Cambridge, Cambridgeshire: Macmillan and Co., →OCLC, page 140