'averseness' originates from English, specifically formed from the adjective 'averse' with the suffix '-ness', where the element 'a-' (from Latin 'ab-') meant 'away' and the root 'vertere' meant 'to turn'.

'averseness' changed from the adjective 'averse' (from Late Latin 'aversus', past participle of 'avertĕre') and the noun 'aversion' (from Latin 'aversiō'), and eventually became the English noun 'averseness' by adding the suffix '-ness' to 'averse'.

Initially, the Latin roots conveyed the idea 'to turn away'; over time the sense shifted to describe emotional turning away—now 'averseness' denotes a feeling of dislike, opposition, or reluctance.