'idiotic' originates from the Greek word 'idiōtikós,' where 'idiōtēs' meant 'private person, layman, or ignorant person.'

'idiōtikós' transformed into the Latin word 'idioticus,' and eventually became the modern English word 'idiotic' through Middle English.

Initially, it meant 'pertaining to a private person or layman,' but over time it evolved into its current meaning of 'extremely foolish or stupid.'