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

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

Initially, it meant 'full of scruples or doubts,' but over time it evolved into its current meaning of 'attentive to details or correctness.'