'anathematically' originates from Medieval Latin, specifically the word 'anathematica,' where 'anathema' meant 'a formal curse' and the suffix '-ically' forms an adverb.

'anathematica' transformed into the English adjective 'anathematical,' and with the adverbial suffix '-ly,' it became the modern English word 'anathematically.'

Initially, it meant 'in a manner of being cursed or condemned,' and this meaning has largely remained the same in modern usage.