Plural of acedia; multiple instances of spiritual apathy, listlessness, or depression, especially in religious contexts.
From Latin acedia, derived from Greek akedia (carelessness, unconcern). The Greek roots are a- (without) and kedos (care). This term gained prominence in medieval Christian theology to describe a spiritual vice.
Medieval monks used 'acedia' to describe what we might now call depression or burnout—it was considered so dangerous to spiritual life that it was listed among the deadly sins!
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