'blasphemous' originates from Greek, specifically the word 'blasphemos,' where 'blapto' meant 'to injure' and 'pheme' meant 'reputation.'

'blasphemos' transformed into the Late Latin word 'blasphemus,' and eventually became the modern English word 'blasphemous' through Old French 'blasfemos.'

Initially, it meant 'injurious to reputation,' but over time it evolved into its current meaning of 'showing disrespect for God or sacred things.'