sophomoric
adjective/ˌsɒfəˈmɔːrɪk/
/ˌsɑːfəˈmɔːrɪk/
(North American English)- showing a lack of maturity (= the ability to behave in a sensible, adult manner)
- sophomoric jokes
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sophomoric
Definition of sophomoric adjective from the Oxford Advanced Learner's Dictionary