'fervent' originates from Latin, specifically the word 'fervēre,' where 'fervēre' meant 'to boil or glow.'

'fervēre' transformed into the Old French word 'fervent,' and eventually became the modern English word 'fervent' through Middle English.

Initially, it meant 'to boil or glow,' but over time it evolved into its current meaning of 'showing passionate intensity.'