'unexpectedly-steered' originates from the combination of 'unexpectedly' and 'steered'. 'Unexpectedly' comes from 'unexpected', which is derived from Latin 'ex-' meaning 'out of' and 'pectare' meaning 'to look'. 'Steered' comes from Old English 'steoran', meaning 'to guide'.

'unexpectedly' evolved from the Middle English 'unexpectid', and 'steered' from the Old English 'steoran', eventually forming the modern English compound 'unexpectedly-steered'.

Initially, 'unexpectedly' meant 'not foreseen', and 'steered' meant 'guided'. Together, they convey the idea of being guided in an unforeseen manner.