
gelungen
successful
Describes something that was successful, well made, or had a positive result. It is used for events, works, plans, or even food.
Das Fest war eine rundum gelungene Veranstaltung.
The party was a thoroughly successful event.
successful / well-done
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successful
Describes something that was successful, well made, or had a positive result. It is used for events, works, plans, or even food.
Das Fest war eine rundum gelungene Veranstaltung.
The party was a thoroughly successful event.

a real character
Colloquial and often slightly ironic for a person who is original, clever, or a bit of a rascal.
Dein kleiner Bruder ist ja ein gelungener Kerl, der hat immer einen lustigen Spruch parat.
Your little brother is quite a real character; he always has a funny remark ready.
'Gelungen' (successful/well-done) is the past participle of the verb 'gelingen' (to succeed). When something 'gelungen ist' (has succeeded), it was successful. The adjective therefore directly describes the result of this verb.
Die Überraschung ist uns wirklich gelungen.
The surprise really worked out well for us.
The verb 'gelingen' (to succeed) needs a person in the dative to say who was successful, e.g. 'Das Bild ist mir gelungen.' (The picture turned out well for me / I succeeded with the picture). Even though the adjective is often used without the dative, this structure helps you understand the meaning.
Mir ist heute ein sehr gutes Essen gelungen.
I managed to make a very good meal today.
'Gelungen' (successful/well-done) is often used to describe the positive result of events, creative works, or actions. Typical combinations are 'ein gelungener Abend' (a successful evening), 'eine gelungene Feier' (a successful celebration), or 'ein gelungenes Foto' (a successful photo).
Das war wirklich eine gelungene Überraschungsparty!
That really was a successful surprise party!
When 'gelungen' (a real character) describes a person, it is colloquial and often meant slightly ironically or affectionately. It describes someone who is special in a funny or clever way.
Mit seinen frechen Antworten ist er ein wirklich gelungener Typ.
With his cheeky answers, he is a real character.
happy / lucky
Both words can express a positive evaluation of something, such as a phrase or a solution. „Glücklich“ highlights a particularly fitting or advantageous choice, while „gelungen“ evaluates the successful result or good execution. „Glücklich“ fits the choice, while „gelungen“ fits the result.

Die Autorin hat eine gelungene Formulierung für den Titel gefunden.
The author came up with a well-crafted phrase for the title.
Die Autorin hat für den Titel eine glückliche Formulierung gewählt.
The author chose an inspired phrase for the title.