Correct spelling, explanation: successful is the correct spelling because the word is an adjective that originated from the noun success and was created by adding the suffix -ful. When we combine the two parts, they form the correct spelling of the word successful. We should remember not to skip the letters at the base of the word.

Definition of successful:
adjective, achieving success, having obtained one’s plans or great achievement
She was told that building a successful business is never-ending work.
By winning the third Olympic gold medal he became one of the most successful athletes in his country.

Incorrect spelling, explanation: sucessful is the incorrect form of the word successful, because of the missed letter c, which should be doubled like in the noun success. The correct form successful was created by adding the suffix -ful to the noun success. There is no need to omit any letters, that is why the form sucessful is not correct.

Incorrect spelling

Incorrect spelling

Incorrect spelling

Incorrect spelling

Incorrect spelling