This root form (lemma) is used in 2 different forms in the NT: ματαιότητι (DFS), ματαιότητος (GFS).
It is glossed in 3 different ways: ‘the uselessness’, ‘of uselessness’, ‘uselessness’.
OET ROM 8:20 Greek word=ματαιότητι (mataiotaʸti) Morphology=DFS English gloss=‘uselessness’ SR GNT ROM 8:20 word 3
OET EPH 4:17 Greek word=ματαιότητι (mataiotaʸti) Morphology=DFS English gloss=‘the uselessness’ SR GNT EPH 4:17 word 18
OET 2PET 2:18 Greek word=ματαιότητος (mataiotaʸtos) Morphology=GFS English gloss=‘of uselessness’ SR GNT 2PET 2:18 word 3