'unmitigated' originates from the prefix 'un-' meaning 'not' and the word 'mitigated' from Latin 'mitigare', where 'mitis' meant 'soft' and 'agere' meant 'to do'.

'mitigare' transformed into the English word 'mitigate', and with the addition of the prefix 'un-', it became 'unmitigated'.

Initially, it meant 'not softened or lessened', and over time it evolved into its current meaning of 'absolute or complete'.