'atypically-shaped' originates from the prefix 'a-' meaning 'not' and 'typical' from Greek 'typikos', meaning 'conforming to a type'.

'atypical' changed from the Greek word 'atypikos' and eventually became the modern English word 'atypical'.

Initially, it meant 'not conforming to a type', and this meaning has largely remained the same in modern usage.