schoolboyish
adjUK /ˈskuːl.bɔɪ.ɪʃ/
Etymology From schoolboy + -ish.
1
Resembling a schoolboy in behaviour.
- ‘I know you think it schoolboyish, but there is a man behind me and a man before, I am part of a chain, a link.’1983, Lawrence Durrell, Sebastian (Avignon Quintet), Faber & Faber, published 2004, page 1119: