Vilipend

   
To vilipend means to regard or treat as of little value or account; to vilify; or to deprecate, to belittle.

I saw one website which suggested it meant to depreciate rather than to deprecate. Oops, I thought. Until I looked up depreciate in the dictionary and found it not only meant to diminish in value over a period of time but it also meant to belittle. I had never previously realised that to depreciate could mean to disparage.