Silly and childish (7)
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 believe the answer is:
puerile
(Other definitions for puerile that I've seen before include "Childishly stupid" , "Childish, silly, trivial" , "Infantile" , "Babyish" , "Childish, immature" .)