'nonrepresentativeness' originates from multiple elements: the prefix 'non-' originates from Latin, specifically the word 'non', where 'non' meant 'not'; the root 'representative' originates from Latin 'repraesentare' via Old French, where 'repraesentare' meant 'to present again'; and the nominalizing suffix '-ness' is from Old English/West Germanic usage forming abstract nouns.

'nonrepresentativeness' was formed by adding the negative prefix 'non-' to the modern English noun 'representativeness'. 'Representativeness' derived from Middle English/Old French forms of Latin 'repraesentare' > Old French 'representer' > Middle English 'representen' > English 'represent' and then the adjective 'representative' plus the suffix '-ness' produced 'representativeness'; the modern compound 'non-' + 'representativeness' yielded 'nonrepresentativeness'.

Initially the related root 'repraesentare' meant 'to present again' (Latin), and through development gave rise to senses of 'to stand for' or 'to serve as a typical example'; over time 'representativeness' came to mean 'the quality of being typical or indicative', and the addition of 'non-' produced the negated meaning 'not having that quality'.