This is the 293rd most frequent German word.
künftig
"Future" or "in the future."
Here, "künftig" is used as an adverb to indicate a future time.
Ich werde künftig mehr Sport treiben.
I will exercise more in the future.
Here, "künftigen" is used as an adjective to describe the noun "Gesellschaft" (society), referring to something in the future.
Der Film gibt eine Vision der künftigen Gesellschaft.
The movie provides a vision of the future society.
In this sentence, "künftig" serves as an adverb to describe actions or intentions related to the future.