Here's what rhymes with opposedness.
Words that almost rhyme with opposedness
brokenness copiousness soullessness dolefulness foaminess hopelessness homelessness eponymous boastfulness wholesomeness lonesomeness smokiness soulfulness atrociousness woefulness exogenous motionless outspokenness loathsomeness ferociousness proteolysis chauvinists emotionless postmistress precociousness unwholesomeness toastmistress ufologists socialists globalists