Pejorative means made to sound bad (literally "to make worse"); it's entirely negative, as your quoted definitions show. I'm not sure what you are looking for; can you explain a little more?
I can't think that there would be a use for a related word meaning "neutral", as that would generally be the default usage for most words; i.e. that they are plainly descriptive. Neither "used" nor "pre-owned" are pejorative; the former is more or less neutral, and the latter is an attempt to make "used" sound more attractive (a euphemism, as bibliolept points out).
Thanks for the comments.
My example of " used cars" and "pre owned" may not have been useful.
Let me try again.
The news paper recently had a headline something like the following:
Chinese officials warn the U.S about awarding the Dali Lama ...
I would say the choice of the word "warn" was pejorative.
I would like to say " the press should be more _____".
I can not put my finger on the best word to fill in the blank.
The words " objective" or "neutral" might work but they do not carry the same sense as "non pejorative".
The problem with " non pejorative" is that it does not differeniate between
the neutral and positive senses. By "positive sense" I would give
the examples: "Pro Life" for anti abortion. "Pro choice" for pro abortion.
In these cases the writer has chosen expressions with a positive "spin".
The pejorative terms seems to convey a negative "spin".
How do you decsribe the case where someone has deliberatly chosen a word with no "spin".
I have no way of knowing if the Chinese "warned" or "cautioned" or
"threaten". The article I saw referred to "Chinese officials". I would have
thought if they interned to "warn" the statement would not have come from
anonymous sources and would not have been vague in its implications.
In the US, the news is shot through and through with "loaded" terms and
language to the point that no one really knows what is going on.
I am trying to find an adjective that describes "non slanted" or " un biased" speech the way that "pejorative" describes a negative tone.
By the way, am I to understand that some of the responses above which
described "Pre owned" as a euphemism mean to say that a euphemism can
not be pejorative?