I keep running into words like "inchoate." I've always considered myself to have--and use--a fairly extensive vocabulary, but I don't even know how to pronounce that one, much less what it means (in·cho·ate 1. not yet completed or fully developed; rudimentary. 2. just begun; incipient. 3. not organized; lacking order; an inchoate mass of ideas on the subject.) It's pronounced [in-koh-it, -eyt or, especially Brit., in-koh-eyt]. (Why do the Brits pronounce so many words differently than we do?)
There are times I run across a new word, look it up and find it very useful. However, there are some words that are so obscure that I wouldn't use them in everyday conversation--what's the point if the other person has no idea what you just said? I must admit to a great deal of frustration and some irritibility when I'm reading a book, as I recently did, only to find out that the author just plain made up words. They weren't invented words, like the magic incantations made up by J. K. Rowling in the Harry Potter books, which were quite logical and charming, but rather were made up words that added nothing to the story and caused me grief looking up words that didn't exist, not to mention making the story fairly incomprehensible.
In case it's not clear, my view on such made-up words is not inchoate. I dislike them very much.