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