This is the 15616th most frequent German word.
wiederholten
"Repeated."
In this sentence, 'wiederholten' is the past tense plural form of the verb 'wiederholen', which means 'to repeat'. It reflects an action performed by multiple subjects (teachers) in the past.
Die Lehrer wiederholten die wichtigsten Punkte vor der Prüfung.
The teachers repeated the key points before the exam.
Here, 'wiederholten' is used as an attributive adjective in the dative plural form to describe the noun 'Versuchen' (attempts), indicating these attempts were done repeatedly.
In den wiederholten Versuchen gelang es ihnen endlich, das Problem zu lösen.
In the repeated attempts, they finally succeeded in solving the problem.
In this example, 'wiederholten' again functions as an adjective, describing 'Fehler' (mistakes) as occurring repeatedly.