'anthropomorphically' originates from English, specifically formed from the adjective 'anthropomorphic' plus the adverbial suffix '-ally', where the suffix '-ally' meant 'in the manner of' or 'relating to'.

'anthropomorphic' comes from Greek elements 'anthrōpos' (human) + 'morphē' (form). The compound appeared in scholarly use (via Late Latin/Medieval scholarly vocabulary and modern European languages) and entered modern English as 'anthropomorphic'; the adverbial form developed by adding the English adverbial suffix '-ally', producing 'anthropomorphically'.

Initially it meant 'having or resembling human form' (literal 'human-shaped'), but over time it evolved to also mean 'ascribing human attributes or qualities' to nonhuman things; the adverb expresses doing this 'in that way'.