Here's what rhymes with defmitiveness.
Words that almost rhyme with defmitiveness
skittishness willingness distinctiveness permissiveness submissiveness vindictiveness descriptiveness derisiveness fierceness siliceous spirituous spiritless griminess filminess litigants iniquitous explicitness restrictiveness implicitness jinrickshas jinrikshas significance certificates precipitous duplicitous coincidence ubiquitous insignificance serendipitous