Incorrect spelling, explanation: the spelling of successfully depends on the spelling of the core noun – success. It is spelled with double s, that’s why adjectives as well as adverb forms are also spelled with double s. Therefore succesfully is an incorrect form, and the correct spelling is successfully.

Correct spelling, explanation: the word successfully is an adverb from the noun success. To create an adverb we need to have the adjective form – in this case successful, to which we add suffix -ly. Since success is spelled with double s (which originates in Latin: succedere + -tus; d and t next to each other transform to ss), the adverb is also spelled like this; not succesfully but successfully.

Definition of successfully:
adverb, in a manner that is successful
Despite bad weather and car problems, we successfully reached the destination.
Maria successfully finished the test.

Incorrect spelling

Incorrect spelling

Incorrect spelling

Incorrect spelling

Incorrect spelling