Answer:
obstinate
Explanation:
The word spelt incorrectly was "obstenate", with the correct version being obstinate.
When you say the word obstinate out loud, you hear ab-sti-nate. However when you say obstenate out loud, it sounds like ab-ste-nate, which is incorrect.
When proofreading words, it is always good to say them out loud, because it ensures you are correct.
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