In a word, intentionally or accidentally? So the regular construction would be accidentally. The jury returned a verdict of accidental death 陪审团.
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On the other hand, middle english used accidentlych as an adverb, and this would produce accidently in modern english. Accidentally：没有附带性；完全出乎意料。 例句：i accidentally broke a glass. Dumbtionary (a dictionary of misspelled words).
The latter one is also accepted but i don't think it's widely accepted in formal writing.
Does this sentence mean 'you' intentionally tried to hurt 'yourself' or accidentally hurt 'yourself'? True, accidentally is the correct spelling.
