Childishly silly or crude (7)

I believe the answer is:

puerile

(Other definitions for puerile that I've seen before include "Childish, silly, trivial" , "Babyish" , "Childishly silly" , "Childish, immature" , "Infantile" .)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.