boyish
/ˈbɔɪ.ɪʃ/ adjective C2- Like a stereotypical boy in appearance or demeanor. · People disliked his boyish and juvenile behaviour.· Her boyish figure belied her femininity.
- Relating to a boy, or occurring in boyhood.
From the library
Over the edge there peeped a clean-cut, boyish face, which looked keenly about it, and then, with a hand on either side of the aperture, drew itself shoulder-high and waist-high, until one knee rested upon the edge.
I saw his dark face lit up with a boyish enthusiasm as he gazed about him.
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