sikerességében
The term "sikerességében" is a Hungarian word. It is the locative case of the noun "sikeresség," which translates to "success" or "successfulness" in English. The "-ben" suffix indicates "in" or "within." Therefore, "sikerességében" directly means "in his/her/its success" or "in their success."
This grammatical form is used to express that something is happening or has happened within the context