'unannotatedly' originates from English, specifically formed from the prefix 'un-' (from Old English 'un-') meaning 'not', the past-participle/adjective 'annotated' (from Latin 'annotatus', from 'annotare'), and the adverbial suffix '-ly' (from Old English '-lic', later '-ly').

'unannotated' developed from the past participle of Latin 'annotare' (via Middle English forms of 'annotate'), and the modern adverb 'unannotatedly' was formed by adding the productive English adverbial suffix '-ly' to that adjective.

Initially, the Latin root 'notare/annotare' meant 'to note' or 'to mark', and combined with the negative prefix 'un-' it originally signified 'not noted'; over time the compound has come to be used simply to mean 'in a way that lacks annotations' in modern English.