'clueless' originates from the English word 'clue' combined with the suffix '-less', where 'clue' meant 'a piece of evidence or information' and '-less' meant 'without'.

'clue' transformed from the Middle English word 'clewe', which referred to a ball of thread, and eventually became the modern English word 'clue'.

Initially, 'clue' meant 'a ball of thread', but over time it evolved into its current meaning of 'a piece of evidence or information', and 'clueless' came to mean 'lacking information'.