
endgültig
final
Concluding, definitive, and no longer changeable. It describes a state or decision that is final.
Nach langer Diskussion trafen sie eine endgültige Entscheidung.
After a long discussion, they made a final decision.
final
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final
Concluding, definitive, and no longer changeable. It describes a state or decision that is final.
Nach langer Diskussion trafen sie eine endgültige Entscheidung.
After a long discussion, they made a final decision.

finally
Used as an adverb to express that a limit has been reached or that something is happening once and for all, often with a feeling of impatience or determination.
Jetzt ist aber endgültig Schluss mit dem Lärm!
That's finally enough of the noise now!
The word is made up of 'Ende' (end) and 'gültig' (valid). So it literally means that something is valid until the end and therefore can no longer be changed.
Das ist mein endgültiges Angebot.
That is my final offer.
'Endgültig' (final/finally) can stand as an adjective before a noun or as an adverb that refers to the verb. As an adverb, it describes that an action is completed finally.
Das ist die endgültige Version des Dokuments.
This is the final version of the document.
In its main meaning, 'endgültig' (final) is often combined with nouns that express a conclusion or a fixed decision. Typical examples are: 'endgültige Entscheidung' (final decision), 'endgültiges Ergebnis' (final result), or 'endgültiger Abschied' (final farewell).
Das endgültige Ergebnis der Wahl wird morgen bekannt gegeben.
The final result of the election will be announced tomorrow.
As an adverb, 'endgültig' (finally) often expresses impatience or determination and emphasizes that a limit has been reached. In this use, it often stands at the beginning of the sentence or is emphasized especially strongly.
Jetzt reicht es aber endgültig!
Now that's finally enough!
definitely / definitive
“Definitiv” and “endgültig” can both confirm a firm decision. “Definitiv” often emphasizes the certainty of a statement, while “endgültig” puts more emphasis on the fact that nothing can be changed anymore. Use “definitiv” to express certainty and “endgültig” when the focus is on completion.

Die Entscheidung über den Termin ist endgültig und kann nicht mehr geändert werden.
The decision about the date is final and can no longer be changed.
Der Termin steht definitiv fest, obwohl noch nicht alle Details geklärt sind.
The date is definitely set, even though not all the details have been clarified yet.