Depreciation
Part of speech: noun
Definition: The act of lessening, or seeking to lessen, price, value, or reputation. The falling of value; reduction of worth. the state of being depreciated.
Example sentence: To the totality of purposes of the perfect Law there belong the abandonment, depreciation, and restraint of desires in so far as possible.
Disparagement
Part of speech: noun
Definition: The act of disparaging, of belittling.