Puerile is an adjective that means childish or silly.
Our word of the day traces its origin to the Latin word puer (POO air) meaning ‘boy’ or ‘child.’ Puerile is basically the adjective form of the word that means ‘like a child.’ But keep in mind that calling someone or something puerile is never a compliment, so think ‘childish’ not ‘childlike.’
I embarrassed myself at work by making a number of puerile comments that day. It isn’t like me to make such silly remarks.