puerileadjective
uk/ˈpjʊə.raɪl/us/ˈpjuː.ɚ.ɪl/disapprovingbehaving in a silly way, not like an adult:
I find his sense of humour rather puerile.
Thesaurus: synonyms and related words
Physically and mentally mature & immature
- adult
- ageing
- aging
- an old/a wise head on young shoulders idiom
- babyish
- grown
- grown up
- head
- immature
- infantile
- juvenile
- mature
- maturely
- maturity
- overgrown
- petulant
- precocious
- precociously
- retarded
- young
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Stupid and silly
puerility
noun [ U ] uk/pjʊəˈrɪl.ə.ti/us/pjuː.əˈrɪl.ə.t̬i/