wanton: [13] Someone who is wanton is etymologically ‘lacking in proper upbringing or discipline’. The word was formed from the Middle English prefix wan- ‘un-’ (a reduced form of the adjective wane ‘lacking’, which is related to the modern English verb wane) and towen, a descendant of Old English togen, the past participle of tēon ‘pull’, hence ‘bring up, train, discipline’. => wane
