Correct spelling, explanation: successful is the correct spelling of an adjective created from the verb success. In this adjective, we use the suffix -ful, therefore version
succesfull is not correct, because there is an unnecessary l added to the suffix. The correct spelling is successful.
Definition of successful:
adjective: obtaining a great achievement, success, wealth, or realize a plan;
I hope my project will be successful, I have put a lot of effort to make it work.
His investment turned out to be pretty successful and he gained money to start his own company.
Incorrect spelling, explanation:
succesfull is the incorrect spelling of an adjective successful. Successful is created from the verb success by adding the suffix -ful. This suffix has only one l and the second one is a misspelling, for that reason the version succesfull is not correct and the right one is successful.
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