DictionaryRoot: wan-
Old English
wan-
lacking, deficient
1 / 1

adjective / noun
wanton
WAHN-tun/ˈwɑːntən/
Unrestrained by concern for consequences or accepted standards.
Etymology
Lacking training or discipline perhaps originally suggested being poorly brought up. The early sense of being willful and resistant to control connects with the later sense of merciless disregard for harm.