How to Say "successfully" in Spanish
The Spanish word for “successfully” is “felizmente” — B1 level.

Examples
Ellos vivieron felizmente por muchos años.
They lived happily for many years.
Felizmente, el vuelo llegó a tiempo a pesar de la lluvia.
Fortunately, the flight arrived on time despite the rain.
La negociación concluyó felizmente para ambas partes.
The negotiation concluded successfully for both parties.
The '-mente' Rule
In Spanish, adding '-mente' to the end of an adjective is just like adding '-ly' in English to describe how an action is done.
Placement in a Sentence
When 'felizmente' describes a verb, it usually comes right after that verb. If it's used to mean 'fortunately,' it usually sits at the very beginning of the sentence.
Confusing 'Feliz' and 'Felizmente'
Mistake: “Él vive feliz.”
Correction: Él vive felizmente (if describing the way he lives) or 'Él es feliz' (if describing his state of being). Use the -mente version when you want to focus on the 'how' of the action.
Related Translations
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