This is the 7130th most frequent German word.
frustrierte
"Frustrierte" means "frustrated."
The word 'frustrierte' is used as an adjective to describe the state of the teacher, indicating her emotional response.
Die frustrierte Lehrerin hatte genug von den lauten Schülern.
The frustrated teacher had enough of the noisy students.
The word 'frustrierte' here functions as a verb in the past tense, describing the action of causing frustration to others.
Er frustrierte die Gruppe mit seiner mangelnden Vorbereitung.
He frustrated the group with his lack of preparation.
In this context, 'frustrierten' again acts as a verb in past tense to indicate the action directed towards someone.