depreciator

transitive verb depreciated, depreciating

1. to reduce in value or price
2. to make seem less important; belittle; disparage

Origin: ME depreciaten < LL depretiatus, pp. of depretiare, to lower the price of (in LL(Ec), to make light of) < L de-, from + pretiare, to value < pretium, price

intransitive verb