acedia comes from Late Latin acēdia, from Ancient Greek akēdía ('indifference, listlessness'), from a- (privative 'without') + kêdos ('care, concern'). Morphologically, the word is transparent as a compound: its parts remain visible in the modern spelling, while the older history of those parts supplies the deeper ancestry. In modern use, the noun sense is "spiritual or mental sloth; apathy and listlessness", which keeps the etymology connected to the word's present dictionary value rather than treating it as a merely historical label. The wider word family includes related English forms such as accidie, showing how the same base continues to support neighboring English vocabulary. The principal historical forms in the chain include Late Latin acēdia, Ancient Greek akēdía, which anchor the explanation in named linguistic material.