'unrepresentativeness' originates from English, specifically formed from the prefix 'un-' + the noun 'representativeness', where 'un-' meant 'not' and 'representativeness' comes from 'representative' + the suffix '-ness' indicating 'state or quality'.

'representative' originates from Latin, specifically the word 'repraesentare' (to represent), where 're-' meant 'again' and 'praesentare' meant 'to place before, present'. 'representative' passed into Middle English via Anglo-French and later formed 'representativeness' with '-ness'; the prefix 'un-' was added in modern English to create 'unrepresentativeness'.

Initially, the root 'repraesentare' meant 'to present (or show) again', but over time it evolved into the modern sense of 'to stand for or serve as an example of a group'; 'unrepresentativeness' thus came to mean 'the quality of not serving as a representative'.