'unintentionally-steered' originates from the combination of 'unintentionally' and 'steered', where 'unintentionally' is derived from 'un-' meaning 'not' and 'intentionally' meaning 'with intention', and 'steered' is the past participle of 'steer', which comes from Old English 'steoran', meaning 'to guide or direct'.

'steer' changed from the Old English word 'steoran' and eventually became the modern English word 'steer'.

Initially, 'steer' meant 'to guide or direct', and this meaning has largely remained the same in modern usage.