the word 'wanton' has a fascinating journey from a concrete descriptor to one of moral judgment. it derives from the middle english 'wantowen', a compound of the prefix 'wan-' (meaning 'lacking, deficient', related to modern english 'wane') and 'togen', the past participle of 'teon' (meaning 'to train, to discipline'). thus, its original literal sense was 'poorly trained' or 'lacking discipline'. this core idea of being ungoverned or unchecked evolved semantically. it first described unruly behavior, then extended to describe unprovoked cruelty (lacking moral restraint), luxuriant plant growth (lacking physical restraint), and ultimately, sexual promiscuity (lacking social or moral restraint). the progression illustrates how a word for a lack of training broadened into a versatile term for any excessive or uncontrolled action or quality.

the word is a simplex form. it originates from middle english 'wantowen', meaning 'undisciplined, unruly'.