Is it simply a pejorative word, or a word that someone uses to describe what they think is an unnatural practice?

The word ideology is a pejorative word; it describes unrealistic, prejudice-begotten thought.

Sometimes a term may begin as a pejorative word and eventually be adopted in an approbative sense.

But you should not use a pejorative word like impostor.

Terms as "pea-brain" and "bottom-feeder" are words and phrases pejorative by their nature.

In my view, Mr President, nonsense is an unduly pejorative word to use.

Then the pejorative word had a run of good luck.

For this reason "middleman" has become very much a pejorative word.