'mindless' originates from Old English, specifically the word 'myndleas', where 'mynd' meant 'mind' and '-leas' meant 'without'.

'myndleas' transformed into the Middle English word 'mindles', and eventually became the modern English word 'mindless'.

Initially, it meant 'without mind or thought', and over time it evolved into its current meaning of 'lacking thought or consideration'.