Here's what rhymes with ultraserious.
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wistarias variance hairiness variants chariots censorious provenience headiness scariness readiness covariance invariance penniless abstemious necessitous pettiness healthiness cerements sexiness sketchiness legginess tetchiness peppiness arbitrariness invariants ordinariness unhealthiness deadliness literariness lengthiness recreants stealthiness dressiness smelliness wealthiness peskiness compendious homeliness twentieths temporariness trendiness comeliness