Words That Rhyme With "Dumbness" :

2 syllables:

gameness, glumness, grimness, gummous, lameness, Lemnos, numbness, oneness, plumpness, primness, sameness, slimness, stamnos, tameness, trimness, youngness

3 syllables:

alumnus, benumbedness, extremeness, humdrumness, Picumnus, sublimeness