'unsurprised' originates from the prefix 'un-' meaning 'not' and the word 'surprised', which comes from Old French 'surprendre', meaning 'to overtake'.

'surprendre' transformed into the Middle English word 'surprisen', and eventually became the modern English word 'surprise'.

Initially, 'surprendre' meant 'to overtake', but over time it evolved into its current meaning of 'to cause someone to feel sudden wonder or astonishment'.