'queasy' originates from Middle English, specifically the word 'quayse,' where 'quayse' meant 'sickly or uncomfortable.'

'quayse' transformed into the modern English word 'queasy,' and eventually led to the noun form 'queasiness.'

Initially, it meant 'sickly or uncomfortable,' but over time it evolved into its current meaning of 'feeling nauseous or uneasy in the stomach.'