She was unintentionally inaccurate.
She was unintendedly inaccurate.
Which one is the better choice/more idiomatic?
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1You should look into the definitions of intent and intend, then add what is unclear. To me it is possibly on purpose vs. by mistake. – user3169 Dec 17 '17 at 22:17
The first is the better choice. But oh that double negative! Being intentionally inaccurate is deception.
She did not intend to deceive.
answered Dec 17 '17 at 21:49
I would definitely say "unintentionally." I've never heard anyone say "unintendedly." If that's a word, it sounds really antiquated.
I'm not sure that I agree with the other answer that says a double negative is bad in this case. Double negatives can make things confusing, but as a native speaker, I don't find your phrase confusing. Depending on the context, I think it could be very appropriate, in fact.
