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I'd probably use "fails" instead of "is unsuccessful."
"Unable," hard to say without more context.
On Mon, Oct 5, 2015 at 7:25 PM, Kari Gulbrandsen
<kkgulbrandsen -at- gmail -dot- com> wrote:
> Hi, all --
> When writing for translation, what phrasing would work better and why:
> - a is unable to do b *or* a is not able to do b
> - x is unsuccessful *or* x is not successful
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