Depreciator in a sentence as a noun

Now only in depreciatory use: affectedly dainty or quaint; over-nice, over-refined, precious, mawkish.> 1905: Punch 8 Mar. 178/1, “`I call him perfectly twee!

Depreciator definitions

noun

one who disparages or belittles the worth of something

See also: detractor disparager knocker