IPA: /əˈsiːdiə/
KK: /əˈsiːdiə/
A state of feeling tired, bored, or lacking interest, often related to a lack of spiritual or emotional energy.
After months of isolation, he fell into a state of acedia, feeling indifferent to everything around him.
Acedia is derived from the Greek word "akēdia" (meaning lack of care or indifference), which is a combination of "a-" (meaning without) and "kēdos" (meaning care or concern). The term originally referred to a state of spiritual or mental sloth, particularly in a religious context.
Think of 'without care' ('a-' means without and 'kēdos' means care) to remember that acedia describes a state of indifference or lack of concern.