enfant sauvage
(ɑ̃fɑ̃ sovaʒ) n,
pl enfants sauvages (
ɑ̃fɑ̃ sovaʒ)
a person given to naive, undisciplined, or unpredictable behaviour, largely because of youth and inexperience
[C20: literally: wild child]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014