'anathematise' originates from Late Latin, specifically the word 'anathematizare', where 'anathema' meant 'a curse' and the suffix '-izare' meant 'to make or do.'

'anathematizare' transformed into the Medieval Latin 'anathematizare', then into the Old French 'anathematiser', and eventually became the modern English word 'anathematise'.

Initially, it meant 'to formally curse or excommunicate', but over time it evolved into its current meaning of 'to denounce or condemn strongly'.