'atypically-presented' originates from the prefix 'a-' meaning 'not' and 'typical' from Greek 'typikos', meaning 'conforming to a type', combined with 'presented' from Latin 'praesentare', meaning 'to place before'.

'atypically-presented' evolved from the combination of 'atypical' and 'presented', reflecting a modern English usage.

Initially, it meant 'not shown in a usual way', and this meaning has largely remained the same in modern usage.