Puerility

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 fact, that most pathologists, despairing of finding such remedies, at one time sank into all the peurilities^([sic – meaning puerilities]) of the "expectant mode" of the French, or the nihilisms of the German.

Source: wiktionary

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.

Source: wiktionary