A synonym for "puerile" is "childish." Both terms describe behavior or attitudes that are immature or lacking in seriousness. Other synonyms include "silly" and "foolish," which also convey a sense of naivety or triviality.
youthful; juvenile silly
Some choices: foolish, idiotic, fatuous, puerile
Absurd, giddy, foolish, vacuous, unintelligent, childish, fatuous, immature, pointless, meaningless, idiotic, unwise, stupid, simple, puerile...
You need to stop acting in such a puerile manner and act your age.
You need to stop acting in such a puerile manner and act your age.
immature
She was making puerile excuses about not wanting to get up for school this morning. That sentence works because it means to be trivial or childish about something.
Belonging to childhood; juvenile. Immature; childish.
preposterous (:
premature and puerile, petty
I think you mean puerile. It means immature or childish.
Adolescent, childlike, childish, inexperienced, puerile, tender...