He began spontaneously to consider whether it would be possible to carry out that puerile notion of Rosamond’s which had often made him angry, namely, that they should quit Middlemarch without seeing anything beyond that preface.
There are no more uses of "puerile" in the book.
Show samples from other sources
The film is filled with clever puns and puerile pranks.
Her campaign proved her to be puerile and feckless.