Puerile is not a common word. It tends to have a negative connotation, while silly may not.
"You puerile boy!" sounds plain insulting compared to "silly"
"The answers they give are plain puerile" would be a good use of the word.
2023年8月6日
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PS : (1) It sounds silly/puerile. (2) You silly/puerile boy! (3) The answers they give are plain silly/puerile.