The phrase 'rapidly-inflated' is formed from the adverb 'rapidly' (from 'rapid') and the past participle 'inflated' (from 'inflate'). 'Inflate' originates from Latin, specifically the word 'inflare,' where 'in-' meant 'into' and 'flare' meant 'to blow.'

'Inflate' changed from the Latin word 'inflare' to the French 'enfler,' and eventually became the modern English word 'inflate.' The phrase 'rapidly-inflated' is a modern English compound.

Initially, 'inflate' meant 'to blow into,' but over time it evolved into its current meaning of 'to fill with air or gas.' 'Rapidly-inflated' specifically refers to the speed of this action.