The quality or state of being depreciatory; the characteristic of tending to reduce value or express disapproval.
From depreciator plus -iness suffix (creating nouns from adjectives showing a state or quality); heavily derived from Latin depreciari with multiple English suffixes stacked.
Words ending in -iness like 'depreciatoriness' are rare and academic because they're technically correct but sound awkward—English speakers prefer shorter synonyms like 'disapproval' instead.
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