I tried to go through several sites, but none of them explained if there is any difference or if any of these variants are not valid (or "not English"). At the beginning, I was using the translation dictionary slovnik.cz to translate from my native language (Czech) and both options were shown as possible:

enter image description here

Usually, I don't find two "same looking" words both valid and formally valid.

Written as (different in count of ls):

  • Successfully
  • Successfuly


  • Is there any difference between them?
  • Is one variation more formal (or valid) then the other?
  • Is there any difference between American and British English in this case?

closed as off-topic by Edwin Ashworth, curiousdannii, user240918, Mari-Lou A, AndyT Mar 15 '18 at 11:48

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  • What language are you translating from? Which translation dictionary are you using? – user121330 Mar 13 '18 at 21:18
  • I have been using slovnik.cz and translating from Czech language. – Tatranskymedved Mar 13 '18 at 21:23

From Google:

Let me Google that for you.

from spellchecker.net

from https://www.spellchecker.net/misspellings/successfuly


"Successfully" is correct. "Successfuly" is a spelling error.

  • I'm sorry to say that, but until You provide some references from this or that source, this seems more like an opinion then the "fact". – Tatranskymedved Mar 13 '18 at 20:37
  • It is not an opinion. I happen to know how to speak English. – fdb Mar 13 '18 at 22:42

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