Here's what rhymes with itterness.
bitterness Words that almost rhyme with itterness
vigorous rigorous wilderness inwardness timorous literates dipterous difference ignorance inference illiterates alliterates coniferous herbivorous vociferous omnivorous interments oviparous riverbanks spinnerets indifference deliverance carnivorous viviparous itinerants pestiferous cordilleras calciferous belligerence barbiturates belligerents carboniferous insectivorous refrigerants disfigurements nonbelligerents