'angulately' originates from English, formed from the adjective 'angulate' plus the adverbial suffix '-ly'; 'angulate' ultimately comes from Latin 'angulatus' (from 'angulus' meaning 'corner, angle').

'angulus' in Latin gave 'angulatus' (Latin past participle), which entered English via learned formation as 'angulate' (adj./v.); adding '-ly' produced the modern English adverb 'angulately'.

Initially tied to the notion of being 'angle-shaped' or 'having corners', it developed the adverbial sense of 'in an angular manner'.