'accidie' originates from Latin, specifically the word 'acedia,' where 'a-' meant 'without' and 'kedos' meant 'care.'

'acedia' transformed into the Old French word 'accidie,' and eventually became the modern English word 'accidie.'

Initially, it meant 'lack of care or concern,' but over time it evolved into its current meaning of 'spiritual or mental sloth.'