unchildish

English

Etymology

From un- +‎ childish.

Adjective

unchildish (comparative more unchildish, superlative most unchildish)

1. Not childish.
   • 2007 October 8, The New York Times, “New CDs”, in New York Times‎^[1]:

     But that doesn’t mean it has been easy for her to outgrow her former self. Ms. Rimes recently turned 25, and though she has always had a remarkably unchildish voice (her 1996 breakthrough single was a beautiful, Patsy Cline-ish song called “Blue”), she has spent much of this decade trying to figure out where she fits on the country-pop continuum.