Crossword Genius

Silly, immature (8)

Ross

I believe the answer is:

childish

I believe this clue is a double definition.

'silly' is the first definition.
(I've seen this before)

'immature' is the second definition.
(similar in meaning)

(Other definitions for childish that I've seen before include "Puerile" , "Juvenile" , "Silly, immature" .)

I've seen this clue in The Mirror.
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