You know... honestly, I've never seen the point of some authors using ridiculously out-dated, archaic, or seldom-used synonyms for perfectly good words just to make themselves look that much more intelligent by forcing their readers to have to look them up.

It seems pompous and pretentious, not to mention, insulting to your audience. It forcibly, and jarringly, removes your reader from the universe you've created if they need to keep referring to a dictionary.

That could just be me, though. :)