'scrupulous' originates from Latin, specifically the word 'scrupulosus,' where 'scrupulus' meant 'a small sharp stone' or 'anxiety.'

'scrupulosus' transformed into the Old French word 'scrupuleux,' and eventually became the modern English word 'scrupulous.'

Initially, it meant 'anxiety or unease,' but over time it evolved into its current meaning of 'diligent and attentive to detail.'