This is the 14513th most frequent German word.
künftiger
"Future" or "prospective."
The word 'künftiger' here is used as an attributive adjective describing 'Beruf' (profession), indicating something in the future.
Mein künftiger Beruf wird im Bildungsbereich sein.
My future profession will be in the field of education.
In this instance, 'künftigen' is an adjective describing 'Generationen' (generations), expressed in plural nominative form, referring to those existing in upcoming times.
Die künftigen Generationen werden von nachhaltigen Entscheidungen profitieren.
The future generations will benefit from sustainable decisions.
'Künftigen' is used here in its declined form (feminine dative singular) to describe 'Wohnung' (apartment), a possession anticipated in the future.