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