(bokmål) barnslig angolul

childish▼(behaving immaturely)
adjective
[UK: ˈtʃaɪl.dɪʃ] [US: ˈtʃaɪl.ˌdɪʃ]

puerile▼(characteristic of, or pertaining to, a boy or boys)
adjective
[UK: ˈpjʊə.raɪl] [US: pjuː.ˈriːl]