'accentless' originates from the word 'accent' combined with the suffix '-less', where 'accent' meant 'a distinctive way of pronouncing a language' and '-less' meant 'without'.

'accent' changed from the Latin word 'accentus' and eventually became the modern English word 'accent'.

Initially, 'accent' meant 'a song or tone', but over time it evolved into its current meaning of 'a distinctive way of pronouncing a language'.