νυνί means “now” (adverb).
“But νυνί, the righteousness of God has been revealed” (Rom 3:21).
Adverb: νυνί (nyni), GK G3815 (S G3570), 20x. nyni is an emphatic form of nyn, although both have the same meaning, “now.” Paul wants the brothers and fathers to listen to his defense “now” (Acts 22:1; cf. Acts 24:13; Rom. 15:23, 25). In 1 Cor. 5:11 he says that he is “now” writing to the Corinthians so that they do not associate with the sexually impure.