Google's dictionary lists it as "un-American" or "unAmerican" (which looks clumsy to me). Since American is a "demonym," I would usually capitalize it, so I feel compelled to capitalize "un-American" somehow. How should I capitalize "un-American" and words like it?
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I decided to search for three forms on the Corpus of Contemporary American English (COCA). Here's what I found:
So it looks like you're right―you probably should capitalize the 'A'. It also looks like there's a strong preference for un-American over unAmerican, so if you want to stick with convention, that's how you should write it, too.
When you apply the prefix un- to a word, two spellings are usually possible: with and without a hyphen. And over time, spellings tend toward the latter. But this word has been around for quite a while, and the hyphen spelling is still going strong! The OED dates un-American back to 1818, and it's certainly been in regular use at least since the 1930s, when the House Committee on Un-American Activities (HUAC) was established. So it certainly seems like in this particular case the word has resisted losing its hyphen over time. I can make two guesses as to why:
Checking COCA for
In any case, since there's a clear convention and you dislike the alternative, you might as well do what most people do: write un-American.