This is the 14184th most frequent German word.
grenzwertigen
"Borderline" or "questionable."
In this context, 'grenzwertige' describes questions that are on the edge of being suitable or appropriate for the exam.
Die Prüfung beinhaltete einige grenzwertige Fragen.
The exam included some borderline questions.
Here, 'grenzwertig' indicates behavior that is close to being inappropriate or unacceptable.
Sein Verhalten gestern war äußerst grenzwertig.
His behavior yesterday was extremely borderline.
In this usage, 'grenzwertig' describes the design as being at the limit of aesthetic or acceptable artistic taste.