'erratically-formed' originates from the word 'erratic,' which comes from Latin 'erraticus,' meaning 'wandering' or 'straying.' The suffix '-ly' is used to form adverbs, and 'formed' is derived from the verb 'form,' which comes from Latin 'formare,' meaning 'to shape.'

'erraticus' transformed into the Old French word 'erratique,' and eventually became the modern English word 'erratic.' The combination with 'formed' created the compound adjective 'erratically-formed.'

Initially, 'erratic' meant 'wandering' or 'straying,' but over time it evolved to describe anything that is irregular or unpredictable in nature.