Plural form of accidie; multiple instances or manifestations of spiritual apathy or despair.
From accidie plus the plural suffix -s. The regularization to a standard English plural shows how the word was fully naturalized into English by the late medieval period.
The fact that someone needed a plural of 'despair' suggests medieval monasteries were documenting an epidemic of spiritual depression—they had a whole taxonomy of different types of monastic despair.
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