verunglückt
injured in an accident
Describing the state of having suffered an accident, often resulting in injury or death.
Der verunglückte Bergsteiger wurde mit dem Helikopter gerettet.
The injured mountaineer was rescued by helicopter.

injured in an accident / botched
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injured in an accident
Describing the state of having suffered an accident, often resulting in injury or death.
Der verunglückte Bergsteiger wurde mit dem Helikopter gerettet.
The injured mountaineer was rescued by helicopter.

'Verunglückt' (injured in an accident / botched) is the past participle of the verb 'verunglücken' (to have an accident). It is used as an adjective to describe a person, a vehicle, or also a thing that is the result of an accident or a failure.
Das verunglückte Schiff sank innerhalb weniger Minuten.
The wrecked ship sank within a few minutes.
In the literal meaning, 'verunglückt' (injured in an accident) usually stands directly before a noun. It then describes the person or vehicle that had the accident: 'der verunglückte Fahrer' (the driver injured in the accident), 'das verunglückte Auto' (the car involved in the accident).
Die Rettungskräfte kümmerten sich um die verunglückten Passagiere.
The rescue workers took care of the injured passengers.
You can recognize the figurative meaning 'misslungen' (failed / unsuccessful) when the word does not refer to a real accident involving people or vehicles. Instead, it describes abstract things such as a joke, an attempt, a formulation, or an evening.
Seine Entschuldigung klang verunglückt und unehrlich.
His apology sounded botched and insincere.
successful
'erfolgreich' and 'verunglückt' are opposites here in a figurative sense. 'erfolgreich' means that a goal has been achieved or something has turned out well. 'verunglückt' then means that something has failed or been done badly. This is not about a real accident, but for example about a speech, a text, a plan, or an attempt. If the result is positive, 'erfolgreich' fits. If something clearly goes wrong or comes across badly, 'verunglückt' fits.

Die Erklärung im Bericht war etwas verunglückt und viele Kollegen verstanden sie nicht.
The explanation in the report was somewhat botched, and many colleagues did not understand it.
Das Gespräch mit dem Kunden war erfolgreich, weil beide Seiten eine Lösung gefunden haben.
The conversation with the customer was successful because both sides found a solution.