'unparalleled' originates from the prefix 'un-' meaning 'not' and the word 'parallel,' which comes from the Greek 'parallēlos,' meaning 'beside one another.'

'parallēlos' transformed into the Latin word 'parallelus,' and eventually became the modern English word 'parallel.' The prefix 'un-' was added to form 'unparalleled.'

Initially, 'parallel' meant 'beside one another,' but with the prefix 'un-,' it evolved to mean 'having no equal.'