Correct spelling, explaination: spelling successful is correct, because it is an adjective from the noun success made by adding the suffix -ful, which gives the meaning full of. Because of the spelling of this suffix successful is the only correct form.
Successfull” is incorrect because of unnecessary double l at the end.
Definition of successful:
adjective, the one that gained success
Jack decided to close his company because it wasn’t successful.
To be successful in your field you have to be determined.
Incorrect spelling, explaination: suffix -ful which we add to the noun to make an adjective gives the meaning able to or full of and is spelled with only one l. That is the reason for the correct spelling successful and why
successfull is the wrong form.
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