'atypical' originates from Greek, specifically the word 'atypikos,' where 'a-' meant 'not' and 'typikos' meant 'typical.'

'atypikos' transformed into the English word 'atypical,' and eventually combined with 'shaped' to form 'atypical-shaped.'

Initially, 'atypical' meant 'not typical,' and this meaning has largely remained the same in modern usage.