Crossword Genius

Silly and childish (7)

Ross

I believe the answer is:

puerile

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

I've seen this clue in The Mirror and The Daily Mail.
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