'unemphasizable' originates from the prefix 'un-' meaning 'not' and the word 'emphasizable', which comes from 'emphasize', derived from the Greek word 'emphainein', where 'em-' meant 'in' and 'phainein' meant 'to show'.

'emphainein' transformed into the Latin word 'emphasizare', and eventually became the modern English word 'emphasize', with 'unemphasizable' forming as a negation.

Initially, 'emphasize' meant 'to show or display', but over time it evolved into its current meaning of 'to give special importance to'.