The latter one is also accepted but i don't think it's widely accepted in formal writing. In a word, intentionally or 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. True, accidentally is the correct spelling. Dumbtionary (a dictionary of misspelled words).
Accidentally：没有附带性；完全出乎意料。 例句：i accidentally broke a glass.
Does this sentence mean 'you' intentionally tried to hurt 'yourself' or accidentally hurt 'yourself'? So the regular construction would be accidentally.
