The quality or state of being worthy of disapproval or criticism.
From discommendable + -ness (a suffix that converts adjectives to nouns expressing a state or quality). This follows the standard English pattern of making abstract nouns from adjectives, creating a noun form that can be discussed philosophically.
Adding '-ness' to already negative words creates this Russian-doll effect of layered disapproval—it's like the word itself is disappointed in whatever it's describing. Medieval scholars loved words like this to add intellectual weight to their criticisms.
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