'setaless' originates from the word 'seta,' which comes from Latin, specifically the word 'saeta,' meaning 'bristle.' The suffix '-less' is used in English to denote 'without.'

'seta' transformed from the Latin word 'saeta' and eventually became the modern English word 'seta.' The addition of '-less' formed 'setaless.'

Initially, 'seta' meant 'bristle,' and 'setaless' has consistently meant 'without bristles.'