Puerility

1. (n.) The quality of being puerile; childishness; puerileness.

2. (n.) That which is puerile or childish; especially, an expression which is flat, insipid, or silly.

Thesaurus Entries

babyishness, boylikeness, callowness, childishness, childlikeness, girlishness, immaturity, imprudence, inadvisability, inattention, inconsideration, indiscreetness, indiscretion, inexpedience, infantilism, injudiciousness, irrationality, maidenliness, pompousness, puerilism, reasonlessness, recklessness, senselessness, stuffiness, thoughtlessness, unintelligence, unreason, unreasonableness, unsensibleness, unsoundness, unthoughtfulness, unwisdom, unwiseness, witlessness