unchildish

comparative more unchildish · superlative most unchildish

1. Not childish.

   1 more example

   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.

   2007 October 8, The New York Times, “New CDs”, in New York Times