teenagerish

English

Etymology

teenager +‎ -ish

Adjective

teenagerish (comparative more teenagerish, superlative most teenagerish)

1. (informal) Characteristic of teenagers; adolescent; immature.
   • 2013, Jenny Davidson, The Magic Circle, page 95:

     “It's not like you needed my help to get the meal ready,” I said snidely, hating how teenagerish I sounded.