Here's what rhymes with defeasibleness.
Words that almost rhyme with defeasibleness
feebleness deaconess deceitfulness heedlessness treasonous ceaselessness steaminess vehemence covetousness edematous sleeplessness peacefulness dreaminess speechlessness cenotaphs speciousness creaminess ingeniousness needlessness recentness egregiousness gleefulness unevenness facetiousness grievousness pediments