Is it okay to make up a word?

I am writing a short story for my creative writing class in high school when Word flagged the word undirected as a misspelling. I don't know that I ever heard the word before, but I was using it in the sense of a kid who grew up with parents who didn't care and didn't provide structure or direction... show more I am writing a short story for my creative writing class in high school when Word flagged the word undirected as a misspelling.

I don't know that I ever heard the word before, but I was using it in the sense of a kid who grew up with parents who didn't care and didn't provide structure or direction for him. Like if he wanted to go to school, that was okay and if he didn't that was okay too.

So is it okay to just make up a word? I mean if you are building words from roots and prefixes. I mean people will know what undirected means in context right?

I know that authors like Rowlings invent words all the time, muggle, quidditch, etc. but do authors ever invent words that aren't part of the world they create?

I remember when Palin created the word "refutiate" and people were all over that.

How do you know when you're being clever creating a word (like muggle which has entered the dictionary) or you're being stupid (like refudiate which has not).
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